Models With 165 Amp Leece-Neville Alternator

1. With the engine off, connect a digital volt-ohmmeter across the battery. Note the reading on the meter.
2. Start the engine and observe the reading on the meter. If the reading rises excessively, the charging system may be damaged or may require adjustment.
3. If the system requires adjustment, remove the nylon screw from the voltage regulator.

Alternator:

4. With the engine at approximately 1000 rpm, carefully turn the adjusting screw clockwise to raise, or counterclockwise to lower the voltage to 14.2-14.3 volts.

NOTE: When turning the adjustment screw, do not force the screw beyond its stop as damage will occur.

5. Replace the nylon screw in the regulator adjustment hole to prevent entry of foreign material into the regulator.
6. If the voltage is excessively high and cannot be lowered by adjustment, replace regulator.
7. If the output voltage cannot be raised, either the alternator or regulator may be at fault.

Alternator:

8. To determine if the cause is with the regulator or the alternator, attach one end of a short jumper lead to the negative rectifier output terminal.
9. Connect the other end of the lead to a short stiff piece of wire at least 1-1/2 inches long.
10. Insert end of the stiff wire into the small hole in the end of the brush holder so it firmly contacts the outer brush terminal.
11. If the voltmeter reading rises with the engine at a fast idle, the alternator is OK and a faulty regulator is indicated.