When testing a cranking system on the vehicle we may have two types of test results. Match the possible causes on the right with the test results on the left.

Question 1

high viscosity engine oil

Answer 1

Slow cranking speed and current draw higher than spec

Question 2

internal electrical shorts or ground faults

Answer 2

Slow cranking speed and current draw higher than spec

Question 3

high resistance in the cranking motor due to worn brushes and commutator bar

Answer 3

Slow cranking speed and current draw lower than spec

Question 4

lack of bushing lubrication

Answer 4

Slow cranking speed and current draw higher than spec

Question 5

mechanical binding of the engine

Answer 5

Slow cranking speed and current draw higher than spec

Question 6

increased engine friction due to cold

Answer 6

Slow cranking speed and current draw higher than spec

Question 7

armature rubbing on the pole shoes

Answer 7

1. Slow cranking speed and current draw higher than spec

Question 8

high resistance due to opens in the field circuits

Answer 8

Slow cranking speed and current draw lower than spec