New Holland LS140 Workshop Manual page 555

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Charging Circuit Voltage Drop Tests

Insulated Side Voltage Drop Tests

1. With the key start switch in the "off" position,

disconnect the battery negative cable and the B+

cable from the alternator B+ terminal, 1.

2. Connect a voltmeter, 3, with a low voltage scale

between the battery positive terminal and the

free end of the B+ cable, 4. The voltmeter

positive lead connects to the B+ cable while the

negative lead connects to the battery positive

3. Connect an ammeter, 2, of 60 amp minimum

capacity between the B+ post of the alternator

and the B+ cable (ammeter positive lead to

alternator).

4. Reconnect the battery negative cable. Connect

a variable discharge rate (carbon pile) load

tester, 5, across the battery terminals. Adjust the

tester for minimum draw (maximum resistance)

before connection.

5. Start the engine and increase speed to

2000 RPM. Slowly increase the current draw

until the ammeter reads 40 amps.

6. When the ammeter reads 40 amps, the voltmeter

should not read more than 0.4 volts.

7. Stop the engine.

If the ammeter reading exceeds 0.4 volts, there

is a high resistance fault in the insulated side of

the circuit.

If maximum output is less than 40 amps and the

voltmeter reading is less than 0.4 volts, proceed

to the Ground Side Voltage Drop Test.

SECTION 55 - ELECTRICAL SYSTEM

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