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.
Alternators - DELCO-REMY With Separate Regulator: Overhaul: Testing: Rotor
To test for grounds, connect a 110 volt test lamp or ohmmeter from either slip ring to rotor shaft or rotor poles. If lamp lights or ohmmeter reading is low, field windings are grounded. To test for open circuit, connect test lamp or ohmmeter to each slip ring. If lamp does not light or if ohmmeter reading is high, windings are open. To test for short circuit, connect a 12 volt battery and ammeter in series with slip rings. If ammeter reading is higher than specified, (see specification table) field windings are shorted. Replace rotor assembly or field windings as necessary.
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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.