1942 - 1947 Chevrolet Shop Manual



	12-13

	Current setting of the regulator is adjusted by bending the spiral spring hanger down to increase the current setting, or bending up on the spring hanger to decrease spring tension and lower current setting, Fig. 25. Normally, all adjustments should be made on one spring and the other spring should not be touched.	Adjustment of this air gap may be made by loosening the screws which mount the upper contact support, two left screws in Fig. 26. The support may then be moved up or down as required to provide an air gap of .075" to .085". NOTE -Be sure points are lined up and tighten screws down well after adjustment. VOLTAGE REGULATOR When checking the voltage regulator, connect the volt ammeter tester to the regulator as follows: Remove the battery wire from the battery terminal of the regulator and connect the positive lead of the ammeter to the battery terminal and the negative lead to the battery wire. Then connect the positive lead of the voltmeter to the battery terminal of the regulator and the negative lead to a good ground, Fig. 27. Start the engine and run it at a speed equivalent to approximately 30 M.P.H.


	Fig. 25-Current Regulator Lower Spring Hangers If the unit is badly out of adjustment, it may be necessary to remove one tension spring and adjust by means of the other tension spring only for its proper setting. With the generator operating at medium speed, adjust the tension of the one spring by bending its hanger up or down until the current regulator unit operates at approximately 17 amperes. Next install the second spring and complete adjustments entirely on this spring to 34 to 36 amperes as previously explained without again touching the first spring. The final adjustment must be made lightly on the second spring. In some cases it may be necessary to readjust the air gap between the armature and core. To check this adjustment push the armature down all the way by hand, then allow it to come back up until points are just touching. Then measure the air gap, which should be from .075" to .085".
		Fig. 27-Volt Ammeter Connections for Checking Voltage Regulator If the output is less than 8 amperes, turn on lights to permit increased generator output, then cut in the resistance on the volt amperage tester by turning the resistance knob to the right until the output is reduced to 8 to 10 amperes. Operate the generator at this speed for at least 10 minutes to bring the regulator up to operating temperature. Retard the generator speed until the circuit breaker points open, then bring generator back to speed and note voltage setting, which should be from 7.2 to 7.4 volts. NOTE -When checking voltage regulator setting the regulator cover must be in place.

	Fig. 26-Air Gap Adjusting Scrawl