Question about 1999 Mercury Cougar

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1999 mercury cougar battery keeps going dead. we pulled the battery sensor fuse and the light went off on the tester

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  • Mercury Master
  • 2,019 Answers

Is the battery being recharged by the alternator?
Meaning, is the alternator putting out 13.5 volts or better, when reved up?

If not, then it is the alternator.
If it is, then the battery probably has in internal short that drains or prevent full recharge.

The one other alternative is that something is on all the time overhight, such as a trunk light. You can tell that by removing a battery terminal cable, and checking for 12 volts across the gap with a test light. Don't just use a voltmeter, because the radio may have a tiny drain to hold station memory. And don't remove a battery cable until after you consider things like radio antitheft mechanisms and codes.

Posted on May 11, 2010

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Posted on Jan 02, 2017

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2 Answers

My # 30 fuse keeps blowing... 99 Mercury Cougar


If it is a 7.5 amp fuse, it powers the charge warning light in the cluster and applies voltage to the alternator to make it charge.
You will need someone to trace that circuit and look for a short to ground. It may be in the cluster or in the harness.
Something else besides the fuse is making the car not start.

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So what do you have for voltage at the battery? Sounds like the alternator went bad. There should be around 14 volts at the battery with the engine running. Anything less and the alternator would be the first thing I suspected.

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check relays/also check h/light bulbs sometimes a over charge can frie the bulbs also could be aproblem in light switch

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1 Answer

Find a fuse


fuse 13, 20 amp, yellow, in battery junction box under hood.

please rate

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