New Holland LS140 Workshop Manual page 556

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Ground Side Voltage Drop Test

1. Ensure the key start switch is in the off position.

2. Test connections are the same as the previous

test except that the voltmeter, 3, is now

connected between the negative post of the

battery and the alternator frame. Connect the

voltmeter negative lead to the alternator frame.

NOTE: Ensure the variable rate load tester, 5, is set

to the minimum current draw position.

3. Start the engine and increase the speed to 2000

4. Slowly increase current draw until the ammeter,

2, reads 40 amps.

5. When the ammeter reads 40 amps, the voltmeter

should not read more than 0.2 volts.

If the reading is in excess of 0.2 volts, there is a

high resistance fault in the ground side of the

If the maximum output reading obtained is less

than 40 amps and voltage drop is within

specifications, the alternator is faulty. Conduct

the alternator component tests outlined in this

SECTION 55 - ELECTRICAL SYSTEM

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