Electrical question on old car
Hello. I hope someone in the know would be kind enough to help me. I have a 1978 Mercury Grand marquis with the 460 v8. Whenever I plug anything into the cigarette lighter, be a charger or cigarette lighter, the fuse for the cigarette lighter blows. Here is what I've done so far, with no success. Checked connections to the lighter plug, checked continuity at the fuse (failed), checked for voltage at the fuse (it showed 12.5 volts), replaced the whole cigarette lighter plug assembly. Still blowing fuses. I noticed when I wiggled the wires to the cigarette lighter, the key buzzer which is intermittently not working, started to buzz. Does this mean there is a problem with the wiring that I am not detecting or a bad ground somewhere? Any information would be appreciated. Thanks!