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Usually goes from the negative post to the engine block. Another one goes from the engine block to the car frame or body. Real easy to find, just trace from negative post of the battery.

I NEED TO KNOW THE GROUND WIRE IS IN THE WIRING HARNESS UNDER DASH.

OR DO YOU KNOW WHAT WOULD MAKE MY SPEEDOMETER, TACH AND TEMP GAUGE NOT WORK ON A 1988 T-BIRD COUPE?

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Q: Where is the ground wire on a 1988 Ford Thunderbird?
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