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 BOSCHDIAGNOSTIC TESTINGCHECKING CHARGING SYSTEM FIELD CONTROL CIRCUIT
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, Automatic
Checking Charging System Field Control Circuit
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, AutomaticSECTION Checking Charging System Field Control Circuit
- Turn ignition off. Disconnect 60-pin connector from SMEC. Connect a voltmeter between F2 cavity in dash panel connector and ground.
- Connect one end of a jumper wire to cavity No. 14 of 60-pin SMEC connector. Turn ignition on. Very quickly touch other end of jumper wire to ground, observe voltmeter.
- If voltmeter reading is 0-1 volt, replace SMEC. If voltmeter does not show 0-1 volt, check wiring for open circuit between SMEC 14-pin and 60-pin connectors.
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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.