Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1981 Plymouth Champ LS, Automatic TransFACTORY OEM SERVICE PROCEDURE
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.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.