why does horn blow when rear defrost button is pushed

Asked by Mar 09, 2014 at 12:51 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

1 Answer

26,285

There is a short to ground. This is a very uncommon condition. Let a pro handle this one. Either something burned some wiring together or perhaps a ground is missing. Tough to guess.

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