Question about 1999 Mercury Cougar
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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