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 MANUALSDODGE AND RAM1990DAKOTA LE, 2D PICKUP, 3.9 X, 4WD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSALTERNATOR - EXCEPT BOSCHBENCH TESTINGROTOR ASSEMBLY TEST
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, Automatic
Rotor Assembly Test
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, AutomaticSECTION Rotor Assembly Test
- Check field slip rings for excessive wear or roughness. If slip rings have only minor damage, clean with fine emery cloth. If slip rings are badly damaged, rotor must be replaced.
- Using an ohmmeter, test for continuity from one slip ring to other. See Fig 1. Continuity should exist. Test for continuity from both field coil slip rings to rotor shaft or core. Test should show open circuit. If failure is detected in either test, replace rotor assembly.
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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.