Question about 1999 Mercury Grand Marquis

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#5 fuse keeps blowing even after i replaced the multifunction switch

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Since you have blown fuse even after renewing the faulty switch,means that you have a wiring which might cause shortage.

Posted on Nov 22, 2013


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2006 lincoln town car ,turn signals and flashers keep blowing fuses no running lights,,replaced lcm,and same

Fuse blow's , short to ground in that circuit somewhere . Viewing wiring diagrams ,so you know which wire's to test using a DVOM - digital volt ohm meter . Or a special short finder tool is how you find the problem . Free wiring diagrams here Enter vehicle info. year , make , model an engine . Under system click on lighting ,then under subsystem click on turn signal lamp . Click the search button then the blue links.
How to find automotive electrical shorts

Principles of Operation
The lighting control module (LCM) controls the flashing of the turn signal and hazard lamps. Power is routed through the multifunction switch to the LCM. When the multifunction switch is placed in the LH turn, RH turn or hazard lamps ON position, the LCM will command those lamps on and off.

have it checked for DTC'S diagnostic trouble codes
B1873 Turn Signal/Hazard Power Feed Short to Ground LCM Go To Pinpoint Test O .

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The wireing to the battery might be loose or rusted or something of that nature. it is most likely that. And let me tell you, thats a pain in the ***

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There is a problem with the I mobilizer software on this model you may have to fit a modified module with software version higher than 5

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My 1998 lincoln continental airconditioner keeps blowing the fuse. replace the fuse it will run while for a short time then blow the fuse. They have replaced the compressor and switch and it still blows...

Ok If it keeps bloowing the fuse it means that its to much resistance in the system. I would reccomend you to take a look at you're blower motor. Even if it work properly it my be durty or to old so it requires more power to spin and then its over heating the wires and the fuse automatically blows up.
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It blows turnsignal and brake light fuses

the multifunction switch has a short in it. Unplug it and the fuses should not blow. If this is the case, replace the switch. But first inspect the wiring going to it

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