TB 065 - Vehicle Battery Systems Flashcards
How did the “Six-Battery System” evolve?
From the need of an electrical system which was capable of maintaining the 800 MHz radio, the UHF Radio, and the VHF Radio and the Mobil Data Terminal (MDT), while having enough amperes to supply the rest of the vehicles electrical requirements
The six battery system has been installed in all heavy apparatus and consists of what?
6 (two sets of three) lead acid 12 volt batteries
What are the batteries rated at?
950 cold crank amperes at 0 degrees F
What is the batteries reserve capacity?
190 minutes at 25 amperes draw per hour
Diesel engines draw approximately how many amperes per cubic inch when starting?
Two amperes per cubic inch when starting
How are the batteries connected to the rest of the electrical system?
Connected in parallel
By having the batteries connected in parallel, this configuration allows what?
The alternator or the on board battery charger to charge all batteries simultaneously
How many batteries are used to start the apparatus?
5 of the 6
Which battery is not connected to the starting circuit and is strictly used to keep the 800 MHz radio, UHF and the VHF Radio and the MDT powered at all times?
Sixth battery (right rear)
How many modifications have been made on all heavy apparatus equipped with the new Six-Battery System?
4 modifications
The battery selector switch has been changed to a simple what?
“On-off” switch
Located in proximity to the old battery switch
The combined use of the 800 MHz radio, the UHF, and VHF radio, and the MDT units causes a constant how many amperes per hour draw on the battery system?
8 amperes per hour draw on the battery system
Due to the constant drain, what has been installed on each apparatus and is connected to the “engine block” heater receptacle?
Automatic onboard (40 amp) battery charger
Heavy apparatus must be what when the vehicle is in quarters?
Must be plugged in
When the battery charger is in operation, the amount of charge will be shown on the ammeter located where?
On the left front side of the charger
What the batteries are at full charge, the charger will automatically what?
Shut off
When the batteries are at full charge, the ammeter will show what and what will illuminate?
Show a reading of zero
Green indicator light on the front of the chargers will activate
When the apparatus is out of service for an extended period of time ( over how many hours) or the on-board battery charger cannot be plugged in, the radio with must be what?
Over ten hours
Radio “cut off switch” must be turned off to avoid running down the batteries
On heavy apparatus, where is the radio “cut off switch” located?
Inside the radio compartment
All apparatus have been installed with a what, which is a audible warning device that activates anytime the batteries fall below how many volts?
“Low voltage warning system”
Fall below 12.2 volts
When the low voltage warning system activates, the apparatus must either be what?
Either started or the on-board battery charger must be plugged in
What has been installed on either the dashboard or the center console?
Digital voltmeter
The voltmeter should be monitored to insure that a minimum of ____ volts are available from the batteries at all times?
12.2 volts
The four battery system are designed for which apparatus?
Rescue Ambulances
The four battery system consists of what?
Two batteries under the hood and toe batteries in the left side compartment of the vehicle
In the four battery system, all four batteries are connected in what, which means that all four batteries are used to what?
Connected in parallel
Used to start the vehicle and operate the electrical equipment
How many specific features are there to the four battery system?
Three
What is located under the passenger seat of the ambulance and is the same used on heavy apparatus?
Battery Charger/ same 40 amperes charger
What is the battery charger on the rescue ambulance connected too?
The “engine block” heater receptacle
Where is the radio “cut off switch” located in the ambulance?
Located under the bench seat in the cabin of the RA
When the ambulance is out of service for over ten hours or the battery charger cannot be plugged in, the radio ‘cut off switch’ shall be what?
Turned off to prevent the batteries from being drained
RA have been fitted with a low voltage warning buzzer, an audible warning will sound when the batteries fall below what?
12.2 volts
Vehicle must be either started or the on board battery charger must be plugged in
The two battery system is designed for who?
Sedans and suburbans
Where are the two batteries located?
Under the hood
One on each side of the engine, both connected in parallel
How many features does the two battery sedans have?
Three features
Emergency sedans have a 40 amperes battery charger located where?
In the trunk and charger plug located on the left rear fender
Suburbans have a charger located where?
In the rear storage area and charger plug on the left front fender
Both sedans and suburbans have a low voltage warning device that will sound an audible warning if the batteries fall below what?
12.2 volts
