New Holland LS140 Workshop Manual page 564

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To check the alternator on a test bench, proceed as

1. Connect the alternator as shown, except leave

the load resistor disconnected.

2. Slowly increase the alternator speed and

observe the voltage.

3. If the voltage is uncontrolled with speed, and

increases above 15.5 V, check the regulator.

4. If voltage is below 15.5 V, connect the load

resistor as shown.

5. Operate the alternator at 2500 RPM and adjust

the load resistor as required to obtain maximum

6. Measure the output current. The output must be

within the limits shown in the section on "Service

Specifications." If the output is less than the

specified value, disassemble and check the

1. Reversed battery connections will damage the

alternator and/or wiring.

2. When connecting a booster battery, make certain

to connect the negative battery terminals

together and the positive battery terminals

3. When a fast charger is used to charge the

battery, disconnect the equipment battery

4. Grounding of the alternator output terminal will

damage the alternator and/or circuit.

5. Do not connect a load of over 1A to the L terminal.

6. If the alternator is operated with terminals L and

B short-circuited, it may damage the diode trio.

SECTION 55 - ELECTRICAL SYSTEM

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