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usually a broken wire causing a dead short(grounding out to the cars body on a power wire)

remove the rear tail light housings and check to make sure that one of the wires is not crimped by the housing (this happens alot on these cars if it simple repair the wire and make sure not to crimp it when re installing the housing if it's not at the housing you'll need to check the wire all the way from the front to the back (this requires removing the seats and the carpet ) your looking for any spots that are showing bare wire and in some cases flat spots on the wire (it's a common problem because the wiring harness doesn't clear the tail lamp assembly when changing blown bulbs and more often then not the wires get crimped

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Q: Why does a Mercury Grand Marquis blow tail light fuses?
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