Fuse blows for interior lights

Asked by Dec 24, 2014 at 11:13 AM about the 2007 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

Fuse blows for interior lights. Headlights and everything else works fine. No work has
been done. Possibly the lcm? Can this be bypassed to verify problem?

2 Answers

1,615

Could be the LCM, but I doubt it. Solder a 12v bulb to an extra fuse (not easy) plug it in, it will light up because of the short. If it only lights up when a door is opened, check each light socket and bulb. If your jury rig bulb goes out, you've found the short. If the test bulb lights with the doors closed, it's a wiring problem somewhere, or possibly the LCM. A big question is does the fuse blow immediately, or after a door is opened? This is a tough one. Someone else may know if the lcm can do this.

1 people found this helpful.
20

I have 2007 Grand Marq with same problem - no interior light and keeps blowing fuse (#18 ). I dropped driver side visor and discovered bare wire shorting out against one of the visor mounting screws. Wrapped bare wire with electrical tape, remounted visor and problem solved. Several years ago we had a Nissan Quest with same problem and paid dealer $500 to find the bare visor wire, so that's the first place I looked on my Merc.

2 people found this helpful.

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