Boat Trailers Flashcards
List of sequential numbers and letters issued by a manufacturer to track trailer production, options, and modifications. Also used to license a trailer
TIN/VIN
TIN/VIN
Trailer/vehicle identification number
VIN requirements defined by
Code of federal regulations (49 CFR 565)
Consists of a 17-digit combination of numbers and letters
VIN
Never use ____ when reassembling a trailer
Pneumatic tools
First rule of thumb for trailering
Ensure the tow vehicle is capable of handling the weight of the trailer, with boat and equipment, as well as passengers and equipment carried in the vehicle
Hitches are labeled with
The proper weight and classifications
Total weight of the trailer plus everything on it
Gross trailer weight
Weight forced down on the hitch ball
Tongue weight
Maximum tongue weight is usually about ____ of the maximum gross trailer weight
10%
CG trailer hitches need to have ____ stamped on them
Class V weight carrying (WC)
Class 1 trailer hitch: gross trailer weight up to ___. Tongue weight up to _____
2000, 200
Class 2 trailer hitch: gross trailer weight up to ___. Tongue weight up to _____
3500, 350
Class 3 trailer hitch: gross trailer weight up to ___. Tongue weight up to _____
5000, 500
Class 4 trailer hitch: gross trailer weight up to ___. Tongue weight up to _____
12000, 1200
Class 5 trailer hitch: gross trailer weight up to ___. Tongue weight up to _____
13000, 1300
Two classification on a hitch identification tag
Weight carrying (WC), weight distribution (WD)
Works by forcing down on the entire frame, transferring the weight through the full length of the tow vehicle in order to keep the tow vehicle and trailer as level as possible
Trailer hitch system
Attaches to the trailer hitch providing a secure fitting to mount the trailer ball
Ball mount
The ball must be ____ inches and have a rating of ______
2 5/16 inches, 10000 lbs or greater
The tongue weight should be _____ when the trailer is level
800 lbs or less
Usually encompasses the couple, surge brake actuator, safety chains, hydraulic reservoir, emergency breakaway chain, and tongue jack assembly
Tongue
Engages the ball and provides a positive mechanical lock between the trailer and the tow vehicle
Coupler
Two common type of brake actuators
Surge brake actuators
Electro hydraulic actuators
Actuates the breakaway lever
Breakaway chain
Hydraulic brake actuators safety chain must be attached to the hitch using
1/4 inch shackle and an additional 1/2 inch shackle
Prevents the brakes from activating in surge brake applications, gets an electrical signal from the reverse lights of the tow vehicle
Reverse solenoid
Provide trailer retention to the vehicle should the coupler disengage from the ball
Two crisscrossed safety chains
Safety chains must be
1/2 inch galvanized steel
Safety chains are attached to tow vehicle’s hitch with
1/2 inch galvanized screw pin shackles that are rated for two tons
Made to support the load of the boat and trailer while not in tow
Tongue jack
The standard jack for the TANB is rated for a maximum static load of ____, with a maximum lift rated at _____
8000, 5000
The standard jack for the RB-S is rated for
2500 lbs
Winches are rated in
Line pull
Line pull is usually measured in
Pounds or kilograms
The rated line pull is with
The first layer of strap or wire rope on the winch drum
As a guide for each layer of a strap or wire rope on the drum, deduct ___ off the rated line pull
10%
Winches operate in three directions
Neutral, forward, reverse
TANB: winch rated at ____ equipped with a ____ minimum rated breaking strength of _____
3500 lbs, 5/16 inch synthetic rope, 14000 lbs
RB-S: winch rated at ____ first layer, _____ with a full drum and equipped with a strap rated with a maximum safe working load of ____
3700 lbs, 1500 lbs, 4000 lbs
Attached and tightened between the pad-eyes found on the boat and the trailer prior to transporting the boat
Tie down straps
Tie down straps need to be rated for at least
6000 lbs
Key function of a boat’s trailer frame
Distribute the weight and load for safe transportation
Coast guard trailers use ____ for the frames, and _____ for the cross members and support structures
Aluminum, galvanized steel
Two basic types of support systems on trailers
Bunks and rollers
Have long, support bunks, usually made of wood or aluminum, and covered with carpet or plastic to soften the surfaces
Bunk systems
Work best on steep ramps where you are able to submerge the trailer deep enough to partially float the boat off and on the trailer
Bunk trailers
Transom should be even with
The back end of the bunk
Type of suspension in coast guard trailers
Torsion axle suspension
This technology produces quicker centering, less lateral sway, and more control
Torsion axle suspension
Within the suspension system, self contained lever within the axle tube surrounded by four natural rubber cords encased in the main structural member of the axle beam
Torsion arm
Attached to the torsion arm which is fastened to the rubber encased bar
Wheel/hub spindle
If torsion axle is damaged
Replace it, do not weld it
Where the bearings, hub, and brake caliper are mounted to the axle
Spindle
Has a threaded connection that is used to retain the bearings and hub assembly
Spindle
If the spindle is damaged, it is recommended
The entire axle be replaced
Two types of braking configurations
Disc and drum
Actuator supplies hydraulic force through the hydraulic line, through the caliper, to the piston, pushing against the brake pad
Disc brake
Disc brakes are separated with ____ which ____
A vane or vent
Helps force air through the brakes and cool them
Trailers with a GVW between ____ and drawn at a speed over ____ may have brakes that operate both wheels of the rear axle
4500 & 15000 lbs, 30 mph
Trailers with a GVW in excess of ___ must have brakes that operate each wheel
15000 lbs
Trailers with a GVW of ____ may use surge or inertia brakes to satisfy the braking requirements
15000 lbs or less
Federally mandated safety measure that will stop the trailer if it becomes disconnected from the tow vehicle
Breakaway brake
Must be completely independent of the tow vehicles braking system or electrical system
Breakaway brake
Can be used in place of semi metallic pads and generate less dust and wear on both the pads and the rotors. Also provide much quieter braking
Ceramic compounds and copper fibers
Due to health risks has been replaced with alternative materials such as mineral fibers, cellulose, aramid, PAN, chopped glass, steel, and copper fibers
Asbestos
Provide strength and conduct heat away from the rotors but also generate noise and are abrasive enough to increase rotor wear
Semi-metallic pads
What bolts must be used for installation of the hitch system
Grade 8 bolts
If any element of the hitch system is loose
A disabling casualty exists
If the tow vehicle and complete hitch system are rated for less than the maximum weight requirement, a manufacturers stamp must be attached, if not
A disabling casualty exists
Those that restrict the operations of the trailer such that it can perform some, but not all missions safely
Restrictive discrepancies
What kind of discrepancy. Damage or disfigurement of the wheel rim flange which results in exposure of the tire bead and/or damage or disfigurement which warps the circular shape of the rim
Restrictive discrepancy
What kind of discrepancy (RB-S). Tire pressure below 20 psi
Restrictive discrepancy
What kind of discrepancy (RB-S). Three or more tires with air pressure below 40 psi
Restrictive discrepancy
What kind of discrepancy. Tire tread depth less than 4/32” (1/8”)
Restrictive discrepancy
What kind of discrepancy (RB-S). Brake/tail light incandescent bulb extinguished (defender A class)
Restrictive discrepancy
What kind of discrepancy (RB-S). Brake/tail light with one or more extinguished LEDs (defender B class)
Restrictive discrepancy
What type of discrepancy. Missing lug nut
Restrictive discrepancy
What type of discrepancy. Missing or flat, improper size, damaged or worn tires
Restrictive discrepancy
What type of discrepancy. Trailer running lights inoperative or wrong characteristic
Restrictive discrepancy
What type of discrepancy. Brake actuator or backup solenoid inoperative or no fluid
Restrictive discrepancy
What type of discrepancy. Wheel bearings or brakes have excessive noise or play
Restrictive discrepancy
What type of discrepancy. Structural cracks
Restrictive discrepancy
What type of discrepancy. (RB-S). Missing safety chains or breakaway brake actuator safety chain
Restrictive discrepancy
What type of discrepancy. Emergency brake latch fails to operate
Restrictive discrepancy
What type of discrepancy. Missing tie down straps
Restrictive discrepancy
How many tie down straps required for the RB-S
Six not including winch strap
How many tie down straps required for the TANB
Two not including winch strap
What kind of discrepancy (TANB). Tire air pressure below 40 psi
Restrictive discrepancy
What kind of discrepancy (TANB). Brake/tail light incandescent bulb extinguished
Restrictive discrepancy
What kind of discrepancy (TANB). Missing safety wire cables or brake emergency chain
Restrictive discrepancy
Those that degrade the effectiveness of the trailer to perform one or more missions
Major discrepancies
What kind of discrepancy. Loose, missing, improper hardware
Major discrepancy
What type of discrepancy. Brake fluid level low
Major discrepancy
What kind of discrepancy. Nonstandard tie down straps
Major discrepancy
What type of discrepancy (RB-S). Missing/damaged E/Z jack
Major discrepancy
What type of discrepancy. Missing section of DOT reflective tape
Major discrepancy
What type of discrepancy (RB-S). Tire air pressure 20 - 39 psi
Major discrepancy
What type of discrepancy (RB-S). Tire air pressure above 50 psi
Major discrepancy
What type of discrepancy (RB-S). Clearance light extinguished (defender A class)
Major discrepancy
What type of discrepancy (RB-S). Clearance light with one or more extinguished LEDs (defender B class)
Major discrepancy
What type of discrepancy. Bearing lubricator damaged or missing
Major discrepancy
What type of discrepancy. Damage or disfigurement of the wheel rim flange which does not result in exposure of the tire bead
Major discrepancy
What type of discrepancy (TANB). Missing/damaged/misaligned bunks
Major discrepancy
What type of discrepancy (TANB). Missing/damaged tire change kit
Major discrepancy
What type of discrepancy (TANB). Tire air pressure 50 - 65 psi
Major discrepancy
What type of discrepancy (TANB). Tire air pressure above 80 psi
Major discrepancy
What type of discrepancy (TANB). Clearance light extinguished
Major discrepancy
TCTO
Time compliance technical order
Basis for changing an asset
TCTO
OEM
Original equipment manufacturer
ORDs
Operation requirement documents
Who can initiate a TCTO
Anyone
Provides information necessary to properly maintain and service a trailer
Manufacturers service manual
Manufacturers service manual for a trailer contains what 8 sections
Index of topics Weight specifications Torque specifications Safety precautions and warnings Procedures for servicing wheels and bearings Service procedures Drawings and schematics Exploded views of different sections
Use of MPCs for performing inspections is
Mandatory
Best way to ensure trailer and trailer component life
Rinsing off all trailer components with fresh water immediately after the trailer has been removed from the salt water
RB-S hitch system rating
10000 lbs, class V
TANB hitch system rating
10600 lbs, class V
Welding the hitch to the frame is
Unauthorized
Ball mount needs
To be stamped or have a sticker indicating class rating, maximum trailer weight, and maximum tongue weight
Proper height of hitch ball mount for TANB
24 inches
Ensure the coupler latch is
Free from corrosion and operates correctly
Inspect surge brake for
Deformity or damage
Ensure the back half of the surge brake actuator is
Properly greased and lubricated
Remove surge brake reservoir cap using
1 1/16-inch socket
The brake fluid reservoir should be at least ____ full of fluid
3/4
Keeping the brake fluid reservoir at least 3/4 full helps reduce
Condensation
If brake fluid shows contamination
Flush the system as per appropriate MPC
If the brake reservoir is low
Add brake fluid (DOT 3)
Keep automotive brake fluid, DOT 3, away from
High temperatures and all sources of ignition and oxidizers
Wear what when handling brake fluid
Chemical safety glasses or goggles and rubber or neoprene gloves
Ingestion of brake fluid may cause
Gastrointestinal tract irritation
Inspect the emergency breakaway lever to ensure ____ and that the hardware holding the breakaway locks are ____
it is functioning correctly
secure and tight (90 to 120 inch-pounds of torque)
How tight should the hardware holding the breakaway locks be
90 to 120 inch-pounds of torque
When the emergency breakaway lever is in the down position (N) it indicates
it is in the ready position
Check for what on the electrical leads for the reverse solenoid
Brittle, chaffed, or broken wires
Inspect brake hose for
cracks, dry rot, and leaking connections
Electric hydraulic brake actuator unit shall be filled to ____
The bottom of the filler neck
If the ball rating is not 2 5/16 inches or properly installed
A disabling casualty exists
If inferior bolts are used for installation of the hitch system
A disabling casualty exists
Whenever a disabling casualty exists, the boat/trailer package shall be
Immediately placed in charlie status and repaired
Illuminate the location and size of a boat trailer
Boat trailer lights
Prevent road debris from damaging vehicles following the trailer and from damaging the boat exterior during towing
Fenders
Type of jack equipped with the RB-S trailer
Emergency roll on jack
Flat spots indicate
Wheel lockup and tire skidding
Cupping indicates
Out of balance
Toe wear indicates
Incorrect toe in
Side wear indicates
Loss of camber or overloading
Edge wear indicates
Under inflation
Center wear indicates
Over inflation
Tread depth for the RB-S
1/16 inch
Tread depth of TANB
1/4 inch
Maximum inflation of the RB-S is
50 psi
Inflation of the TANB is normally
80 psi
Check tire inflation pressure how often
Weekly
Most important factor in tire life
Tire inflation pressure
A force of 85 pounds applied at the end of a wrench one foot long will yield
85 ft lbs of torque
Relationship of the centerline of the tire to the hub face of the axle
Offset
Three characteristics of wheels
Bolt circle, capacity, offset
Combination of the tire and rim
Wheel
The amount of up, down, and side to side motion that the bearings allow the hub assembly to move
End play
Support both radial and axial loads, and generally can carry higher loads than ball bearings due to the greater contact area
Tapered roller bearings
Currently being used on the TANB trailer. This system converts the standard system into a pressurized leak-proof system that keeps salt water and contaminates out of wheel bearings
Air-tight bearing protector
House the bearing sets that allow the entire wheel hub assembly to spin on the axles spindle
Bearing hubs
Brake discs are manufactured out of
Cast iron, grey iron, or stainless steel
Have a removable disc that separates from the hub
Two piece systems
Has a hub incorporated into the disc
One-piece system
Harness the friction applied by the calipers and brake pads to stop the trailer
Brake discs
Squeal when the pad has worn down to its replacement thickness
Wear indicators
Whenever a disabling casualty exists, who should be notified
CO/OIC
What bolts must be used for installation of the hitch system
Grade 8 bolts
If the brake fluid shows contamination ____
Flush the system as per appropriate MPC and consult the proper technical publication for proper flushing procedures
When using general purpose grease or equivalent via the zerk fitting ____
Fully cycle the tongue jack while lubricating the gears
Remove the tongue jack cap to inspect
For cracks in the cap and corrosion in the gears
Boat winches are to inspected with the ____
Rope or strap fully paid out
Inspect the winch rope/strap for ___
Fraying, tears, fiber separations, and creases
Inspect the winch drum gears for ____
Missing teeth, corrosion and rust
Inspect and lubricate the winch gears and brake actuator using ____
General purpose grease or equivalent
Before taking the trailer and boat into tow, you must ensure ___
That the boat is properly secured to the trailer
The final mechanism to keep the vessel or asset from coming off the trailer if involved in an accident
Safety tie-downs and straps
Always ____ tie-downs when inspecting them
Remove
Lubricate trailer straps mechanism with ___
All-purpose grease or equivalent
Inspect trailer tie-down points for
Loose bolts and/or missing bolts and nuts
Best way to prevent corrosion and rust
Fresh water flushing
The only way to prevent trailer degradation
Continuous maintenance
____ will corrode faster than steel bolted to steel
Dissimilar metals
Inspect trailer structure for ___
Bent structures, corrosion, rust, cracks, and/or deformities
All hardware and securing eyes should be ___
Tight and free from rust or corrosion
Ensure rivets, skid plates, and protection pieces are ___
Flushed thoroughly and are in good repair
Ensure the ladder is ___
Securely fastened to the trailer frame and has good non-skid strips on the steps
Ensure all retro reflective material is
Marking and is in good repair
Inspect all instructions and warnings ensuring they are
Legible and in the proper location
Very important in ensuring the hull structure remains uniform and undamaged during long and varying transits through diverse conditions
Support systems (bunks and rollers)
Bunk height should be ____
Uniform side to side, fore, and aft
Keeps rust and corrosion from accumulating on the running gear and axles
Flush kit
Flushes the wheels, brakes, and axles
Flush kit
If replacing any hardware, only replace with
Manufacturer’s recommended hardware
When inspecting brake lines, ensure ___
the brake lines are not bent, chaffed, kinked, cracked or loose
Most of the Coast Guard’s brake lines are constructed of ____
1/8-inch stainless steel tubing with brass fittings
Brake line tubing terminations are usually
Double-flared
The entire brake line assembly is rated at
3000 psi
Brake hoses are constructed of
Synthetic rubber and wire impregnated or reinforced 1/8-inch hose, capable of resisting the chemical properties of brake fluid
Brake hoses must be
DOT approved and rated for 3000 psi
When inspecting brake hoses, ensure ____
there is no chafing, kinks, binds, crack, or dry rot, and that they are affixed correctly
Trailer brake lines are coiled because ___
Trailers are built to flex
Which part of the trailer may have a need for chafe gear
Brake lines and hoses
Before conducting maintenance on a trailer ____
Notify your first line supervisor and the EPO
First step to completing trailer maintenance
Ensure the trailer has no load, is on a level surface, and the tires are chocked
Where should the danger tag for maintenance on a trailer go
Trailer tongue
Loosen lug nuts how much and where
Half a turn only on the rims to be removed
Where is the jack point on a trailer
Under the frame in front of the tongue jack
Jacks should always be used in conjunction with ____
A rated weight support device or jack stand
Before removing the lug nuts ____
Check the wheel bearing end play
Any noticeable end play could indicate
Loose axle nut or most likely worn wheel bearings
After lug nuts are removed place them ____
In a plastic bag
Inspect the lug nuts and studs for ____
Corrosion and rust, damaged threads, loose studs
If not removing the brake line from the caliper
Set the caliper on a stable surface or wooden block
If removing the brake line
Make sure a suitable container is placed under the brake line once it is disconnected
It is recommended that a brake pad be replaced if it is ____ of its original size and/or ____
1/4 inch
The wear indicator in the pad has worn off of the squealer where the indicator has made contact with the rotor
The thickness of a new inner brake pad is approximately ____
0.640-inch (including mount plate)
The thickness of a new outer brake pad is approximately ____
0.450-inch (including mount plate)
What should be worn when working on brakes
Approved filter mask
Never blow out brakes with ____
Compressed air
Use of _____ to clean brakes is a fire danger
Petroleum-based solvents
Brake pads must be replaced in ____
Pairs
Ensure retention tangs are not
Rusted or missing
Ensure the bleed valve has not been _____ and that the hex has not been ____ on the brake calipers
Crushed
Rounded
Ensure the fittings of the calipers are ____
Brass
Inspect the brake disk for
Warping
Pitting
Cracking
Scoring
If the dial indicator exceeds _____, the rotor is warped (brake disc)
.004
If the rotor is warped beyond .004 it should be ____
Machined or replaced
Remove the forced bearing lubricator cup by ____
tapping on the outer edges until you can remove it from the hub
If any bearing is ever dropped it must be ___
Replaced
Never ____ a grease seal
Re-use
Clean all grease from the hub using
Dry cleaning solvent, MIL-PRF-680, Type III
If one race is damaged
All the bearings and races are to be renewed for the entire axle
When replacing bearing races, use a ____ to tap out the races
Brass punch
Tap out the inner race in ______ pattern
Crisscross
When inspecting the spindle, check for ___
Burrs, barbs, and discoloration
Measure both bearing lands to ensure
The bearings did not seize or spin
Inspect the grease sealing surfaces of the spindle to ensure
It is not corroded or damaged
Check the threads on the spindle by ___
Chasing the spindle nut up and down the threads
Preferred method for installing a wheel bearing race is with ____
Arbor press
Secondary method for installing a wheel bearing race
Brass punch
Pack the ____ bearing first
Inner
Wear when applying grease to wheel bearings
Powder free latex gloves
When packing wheel bearings, apply approximately ____ of bearing grease to the palm of your hand
One tablespoon
Ensure the brake bleed valve hose is installed on ___
The top of the caliper
Open the bleed valve on the caliper about ___ using a ____ wrench
1/2 turn
1/4-inch
When installing lug nuts, ensure ____
The taper side is mounted in the rim
Start all lug nuts by hand to avoid
Cross-threading
After ____ miles, re-torque the lug nuts to ____, using a _____ pattern
100
85 foot-pounds
Star
Trailer lights use ____ for their wiring
16 - 14 American Wire Gauge (AWG) stranded copper
Primary cause of trailer electrical failures
Corrosion
Vehicles with a gross vehicle weight (GVW) below ____ must display at nighttime or when visibility is below ____
4500 lbs
1000 ft
Tail lamps must be at a height of ____ and ___
15 - 72 inches
At the same level, as widely spaced as possible
The tail lamps must consist of
A red light plainly visible at 1000 ft, and a tail lamp or separate lamp that emits a white light to illuminate the rear license plate, clearly visible at 50 ft
Stop lamps must be
Red or amber light, or a colour in between, plainly visible at 300 ft in sunlight, may be part of another lamp
Turn signals must be
White or amber, or a colour in between if mounted in front of the vehicle
Turn signals must be visible from ____ of the front and rear of the vehicle if the vehicle is 80 inches wide, ____ if it is less than 80 inches wide
500 feet
300 feet
Reflectors must be
At a height of 15 - 60 inches, visible at night at all distances, visible from 100 - 600 feet when directly in front of lawful lower beams of headlamps
Trailers that are at least 80 inches wide will also be equipped with
Four clearance lights, two front, two rear. Four side marker lights, four reflectors, and hazard lamps
Trailers that are at least 30 ft long shall be equipped with
Two side marker lamps, one centrally mounted on each side. Two reflectors, one centrally mounted on each side. And hazard lamps.
Front or center clearance lamps, identification lamps, side marker lamps or reflectors must be or reflect ___
Amber
Rear clearance lamps, identification lamps, side marker lamps, or reflectors must be or reflect ____
Red
Reflectors must be mounted at a height from ____, or ____
24 - 60 inches
As high as practical if less than 24 inches
Clearance lamps shall be mounted to ___
Indicate the extreme height and width
Clearance and side marker lamps may be mounted ____
In combination
Clearance lamps, side marker lamps, and identification lamps must be visible under normal atmospheric conditions at all distances between ___
50 and 100 feet
Reflectors must be visible at nighttime distances from ____
100 - 600 feet of lawful lower beam headlamps
Standard boat trailers are required to have (lighting)
Retro-reflective tape, reflectors, tail lights, brake, signal, and license plate lights
The filament is made from ___
A material with greater resistance than the wires linking the battery and bulb
White wire in a trailer’s light connections
Ground wire
Red wire in a trailer’s light connections
Reverse solenoid
Blue wire in a trailer’s light connections
Brakes
Brown wire in a trailer’s light connections
Tail/running lights
Black wire in a trailer’s light connections
12-volt power supply
Green wire in a trailer’s light connections
Right turn signal
Yellow wire in a trailer’s light connections
Left turn signal
RB-S uses how many pins in the 7 pin connector
5 (1, 5, 3, 6, and 7)
TANB uses how many pins in the 7 pin connector
6 (1 - 6)
Pin #1
White ground
Pin #2
Blue electro hydraulic brakes
Pin #3
Brown tail/running lights
Pin #4
Black 12-volt power supply
Pin #5
Yellow left turn signal
Pin #6
Green right turn signal
Pin #7 (or center)
Orange (or purple) reverse solenoid
Best defense for preventing corrosion and damage to trailer wiring systems
Heat shrink used in conjunction with wire tinning
Impervious rubberized material that keeps water from entering a butt splice or wire connection. It has chemical on the inside surface that is heat activated
Waterproof heat shrink
Plating each strand of wire with a thin coat of solder is called ____
Tinning
Solder is typically made of
60% tin
40% lead
Tinned wire is sometimes called
Marine Grade Wire
A solenoid valve coil can be tested by ___
Taking a resistance check across the solenoid
A good coil has a resistance of ___ (reverse solenoid)
15.8 ohms
Device in the tow vehicle that supplies power from the tow vehicle to the electro hydraulic brake actuator
Electric trailer brake controller
When adjusting the electric trailer brake controller, drive the vehicle at ____
10 - 15 mph
Mounted on the trailer and takes the signal voltage from the tow vehicle brake controller and converts the power to proportional hydraulic pressure that is sent to the trailer brakes
Electro-hydraulic brake actuator
Has a direct current motor with a hydraulic pump
Electro-hydraulic brake actuator
Electro-hydraulic brakes must be equipped with
A breakaway switch and emergency power supply
Built in on the electro-hydraulic brake actuator to protect the trailer breakaway battery from overcharging
Small charging unit
Black wire going to the electro-hydraulic brake actuator
Battery voltage from the tow vehicle and the battery on the trailer/charger (20 amp, 12-volt supply)
Blue wire going to the electro-hydraulic brake actuator
Output from in-cab electronic brake controller
White wire going to the electro-hydraulic brake actuator
Trailer and tow vehicle ground
Yellow wire going to the electro-hydraulic brake actuator
Cold side of breakaway switch
The input and output wires from the tow vehicle to the actuator must be properly sized and terminated, using a dedicated ______ circuit on the tow vehicle, and ____ gauge wire minimum
25 - 40 amp
12
___ gauge wire is recommended to optimize performance with the electro hydraulic brake actuator
10
Low temperature applications below 0*F require a ______ circuit (Electro hydraulic brake actuator
40-amp
Minimum brake force is applied when ____ is applied to the hydraulic brake actuator
3 VDC
Maximum brake force is applied when ____ is applied to the hydraulic brake actuator
12 VDC
Submersible wiring for the lamp assembly enters the watertight enclosure by means of _____
A grommet or seal
Cover the electrical tips at the base of the bulb with ____ to keep off the corrosion
Dielectric grease
If none of the lights work check
The ground wire
If some of the lights work check
The bulbs and sockets for corrosion or a burned out bulb
The hot wire that forms the rest of the circuit to the light fixture
Broken wires
Safer way of checking vehicle wiring, shows if the tow circuit is properly configured, one end tests a 7 way plug, and the other tests a 4 way plug. Pinpoints where problem exists
Trailer circuit tester
Clean and lube trailer light connection plug and wiring with
Silicone insulated grease
Another name for silicone insulated grease
Molykote DC 44, Mil-L-15719A
First step in replacing electrical parts on the trailer
Tag out
On brake lines, do not apply pipe sealant to threads that are ___ from the end of the pipe or closer
1/8”
Thread sealant is also called
Loctite 565 PST
Loctite 565 PST may cause
Dermatitis
Ensure that no sealant contaminates the ____ of the brake lines
Interior
The reverse solenoid ground wire should be attached to ____
Trailer actuator bolt
The reverse solenoid ground wire should be a ____ length of number _____ wire and terminate with a ____
3-foot
14
Ring-type terminal connector
