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 FIELD CONTROL TO SMEC FOR SHORT CIRCUIT
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, Automatic
Checking Field Control To SMEC For Short Circuit
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, AutomaticSECTION Checking Field Control To SMEC For Short Circuit
- This checks field circuit to the SMEC. Turn ignition off. Reconnect SMEC 14-pin connector. Disconnect SMEC 60-pin connector. See Fig 1.
- At alternator, trace one of the field terminal wires back to Black 8-pin connector at rear of battery. Green wire-to-Green wire at connector is F2 and Green wire-to-Blue wire at connector is F1. See Figure.
- Connect voltmeter between F2 wire on dash side of Black 8-pin connector and ground. Turn ignition to RUN position. Voltage reading should be within one volt of battery voltage. If okay, go to ALTERNATOR FIELD CONTROL FROM 14-PIN TO 60-PIN CONNECTOR .
- Turn ignition to RUN position. If voltmeter reads between 0-1 volt, replace SMEC. Test pin No. 11 of 14-pin connector for a short to ground. Test should read an open circuit.
- If both tests are not as specified, ensure Dark Green wire is not shorted to SMEC connector or alternator connector. If Dark Green wire is okay, replace SMEC.
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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.