Alternator Regulators: Testing

NOTE: Battery specific gravity should be above 1, 200 for a proper regulated voltage check. Charge battery or use a good test battery before testing regulator.

Connect positive lead of voltmeter to positive post on battery. Connect negative lead from voltmeter to a good vehicle body ground.
Start and run vehicle at 1250 RPM with all lights and accessories turned off. Check voltmeter, regulator is working properly if voltage readings are within specifications.

If voltage is not within limits or is fluctuating, check that regulator has a good ground. With engine off, disconnect regulator terminals. Turn ignition on, but do not start engine. Battery voltage should appear at both blue and green leads of connector. If all tests are satisfactory, replace regulator and repeat tests.

SPECIFICATIONS

Ambient Temperature⁽¹⁾

Voltage Range

-20°F

14.9-15.9

80°F

13.9-14.6

140°F

13.3-13.9

Above 140°F

Less than 13.3

⁽¹⁾	Ambient temperature is measured 1/4;" from regulator.