Regulator Check (Heavy-Duty Alternator)

NOTE: As regulator is fully enclosed, there is no practical test of this unit.

If none of the previous tests shows any defects and an overcharged condition was present, remove voltage adjustment cap (connector body) from slip ring end frame. Using an ohmmeter with middle range scale, attach leads to each pair of adjacent terminals (4 checks in all). See Fig 1.

Fig 1: Bench Testing Voltage Adjustment Cap (100 Amp. Heavy-Duty Alternator)
Courtesy of GENERAL MOTORS COMPANY

If any check is infinite, replace adjustment cap. There is no need to make this test for an undercharged condition.

DELCO-REMY DELCOTRON SPECIFICATIONS
Stamped Rated Amp. Output	Test Specifications (At 14.0 Volts)				Field Current (Amps.) 12 Volts @ 80°F
Stamped Rated Amp. Output	Amps.	RPM	Amps.	RPM	Field Current (Amps.) 12 Volts @ 80°F
37	22	2000	33	5000	4.0-4.5
42	25	2000	38	5000	4.0-4.5
55	30	2000	51	5000	4.0-4.5
61	30	2000	57	5000	4.0-4.5
63	32	2000	60	5000	4.0-4.5
80	55	2000	76	5000	4.0-4.9
100	.....	.....	.....	.....	4.5-4.9