Having problems with your Mercury Grand Marquis ?
I have a 89 grand marquis and as soon as you put the terminal on the battery it starts draining it and nothing is on inside the car
With a regular test light disconnet the positive cable leave negitive connected to the battery clep the one end of the test light to the battery the other end to the positive cable the light will be on go to the fuse box remove and install each fues one by one until the light goes off leave the fuse out you fixs your short
Repair Help & Product Troubleshooting for Mercury Grand Marquis
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