Question about 1999 Mercury Grand Marquis

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98 grand marquis alternator

All lights dim and brighten about twice a second at night. suspect regulator in alternator. what's your opinion?

Thanks

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That would be the first guess, but fortunately this is easy to test. What other electronics are running at the same time? If you take it to autozone they can test the alternator and battery for free and let you know for certain. I hope this helps.

Posted on Jun 21, 2009

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