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 MANUALSJEEP1987WAGONEER BASE, 4.0 M, AUTOMATICREPAIR AND DIAGNOSISBODY & FRAMEPOWER WINDOWSTESTINGMASTER SWITCH CIRCUIT
1987 Jeep Wagoneer Base, 4.0 M, Automatic
Master Switch Circuit
1987 Jeep Wagoneer Base, 4.0 M, AutomaticSECTION Master Switch Circuit
- Remove escutcheon and housing from master switch. Separate terminal plate by releasing retainer hooks to expose terminal ends. Turn ignition on.
- Using a 12-volt test light, connect one lead to Black wire and other lead to Red terminal. Repeat test at second Black wire. If test light does not glow in either test, remove lead to Black terminal and connect to chassis ground.
- If test light glows, an open exists between master switch and ground. If test light does not glow, it indicates a defective circuit breaker or an opening in the Red wire from circuit breaker to master switch.
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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.