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 MANUALSMERCURY1989GRAND MARQUIS GSREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTWIPER/WASHER SYSTEMSTESTINGWIPER MOTOR CURRENT DRAWMUSTANG
1989 Mercury Grand Marquis GS
Wiper Motor Current Draw: Mustang
1989 Mercury Grand Marquis GSSECTION Mustang
- Disconnect battery negative cable. Disconnect linkage and electrical plug from wiper motor. Connect Green ammeter lead from Rotunda Starting and Charging Tester (07800005) to battery positive post.
- Attach jumper wire from ground terminal on connector A to body ground. Connect positive (Red) lead from tester to low-speed terminal on connector A. See Fig 1. Read current draw.
- Remove positive (Red) tester lead from low-speed terminal and connect positive lead to high-speed terminal at connector A. See Fig 1. Current draw should not exceed 3 amperes in either test.
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.