ASE4 Engine Electrical Systems

Question 1

A technician performs a voltage drop test across a battery cable and finds 0.8 volts with the engine cranking. This indicates:

Accepted Answer

Excessive resistance in the cable causing a voltage drop concern

Answer

Normal resistance for a copper cable

Answer

The battery has insufficient capacity

Answer

The starter motor is drawing too much current

Question 2

What is the purpose of the alternator's voltage regulator?

Accepted Answer

To maintain charging voltage within a safe range regardless of engine speed

Answer

To convert AC current to DC current for battery charging

Answer

To limit maximum alternator output current

Answer

To sense battery temperature for optimal charging

Question 3

A battery load test shows the voltage drops to 9.2 volts under load. This result indicates:

Accepted Answer

The battery failed and should be replaced

Answer

The battery passed and is serviceable

Answer

The alternator is overcharging the battery

Answer

Normal voltage drop under cranking conditions

Question 4

An alternator output test shows only 12.8 volts at 2,000 RPM with lights and accessories on. Normal is 13.5–14.7V. This indicates:

Accepted Answer

Low alternator output requiring further diagnosis

Answer

Normal output — the battery is fully charged

Answer

The battery is being overcharged

Answer

A faulty battery not accepting charge

Question 5

A starter motor cranks the engine slowly. Battery tests good. The NEXT step is to:

Accepted Answer

Perform a starter current draw test and voltage drop tests on starter circuits

Answer

Replace the starter motor immediately

Answer

Check the flywheel ring gear for damage

Answer

Replace the battery cables

Question 6

When checking charging system output, the technician should perform the test with:

Accepted Answer

The engine running at 2,000 RPM with a moderate electrical load applied

Answer

The engine off and key on

Answer

The engine at idle with no loads

Answer

The engine at WOT for maximum alternator output