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Old 08-27-2009, 12:47   #1 (permalink)
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2006 Grand Marquis Battery Question

Hello All,
While replacing the battery in my 2006 Grand Marquis, I accidentally reversed the polarity when reattaching the cables. I noticed my mistake after only a couple of seconds and then attached them properly. Now, radio/cd player does not work and two of the dummy lights (Brake and ABS) are on all the time. Any ideas out there as to what I might have done/need to do to get everything back to normal? Thanks.
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Old 08-27-2009, 13:26   #2 (permalink)
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Re: 2006 Grand Marquis Battery Question

Not sure what to tell you. Does the car run? That can fry the PCM and the car won't run.
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Old 08-27-2009, 13:42   #3 (permalink)
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Re: 2006 Grand Marquis Battery Question

Yes the car runs fine. So, hopefully it's not the PCM.
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Old 08-27-2009, 14:00   #4 (permalink)
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Re: 2006 Grand Marquis Battery Question

If it runs your PCM should be okay. I don't have access to a diagram but when I do, I'll see what it could be. Meanwhile someone else may have an answer. I beliave there are diodes in the engine compartment fuse box. It may have damaged one or more. There are 3 of them 501 502 503. You could have them checked to see if they are okay.
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Old 08-27-2009, 14:30   #5 (permalink)
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Re: 2006 Grand Marquis Battery Question

Thanks alot, I'll have them looked at tomorrow. If it is the diodes, is this an expensive repair job?
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Old 08-27-2009, 14:34   #6 (permalink)
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Re: 2006 Grand Marquis Battery Question

The older cars had some that plugged in like fuses. Those might too. You could even try switching them if they have the same markings on them.
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Old 08-27-2009, 15:19   #7 (permalink)
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Re: 2006 Grand Marquis Battery Question

Hello RTG143,
Thanks for your help, but I figured it out. Two fuses were blown in the fuse box under the steering column. I swapped them out and the radio now works and the dummy lights that were on are now off. Once again, thanks for your timely replies to my post.
Dan
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Old 08-27-2009, 15:52   #8 (permalink)
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Re: 2006 Grand Marquis Battery Question

You're welcome and thanks for letting us know the outcome. I'm suprised but happy that it wasn't an expensive problem.
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