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.
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HOMESERVICE MANUALSAUDI1999A6 BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSGENERATORS & REGULATORSBENCH TESTINGROTOR
1999 Audi A6 Base
Bench Testing: Rotor
1999 Audi A6 BaseSECTION Rotor
- Set ohmmeter on lowest scale. Connect ohmmeter leads between slip rings. If resistance is less than 2.8 ohms, rotor windings are shorted. Replace rotor. If resistance is greater than 3.1 ohms, high resistance exists in rotor windings. Replace rotor.
- Set ohmmeter on 1000x scale. Connect ohmmeter leads between either slip ring and rotor. If continuity exists, rotor is grounded. Replace rotor.
- Clean slip rings using sandpaper. If rings are worn or pitted, turn them on lathe. Minimum slip ring diameter is 1 1/16" (27 mm).
- If slip rings cannot be repaired, remove rear bearing from slip ring end of rotor. Unsolder wires from slip rings. Bend up ends of rotor winding. Pull off slip rings. Ensure ends of rotor winding are not damaged.
- Insert ends of rotor winding into slip ring, and press new slip ring onto rotor until slip ring end is 9/64" (3.57 mm) from end of collar. Solder rotor winding to slip ring terminals. Turn rings on lathe, and retest rotor. Maximum slip ring runout is .0012" (.03 mm).
RENDER: 1.0x
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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.