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It is most likely the Altornator, But it could also be A bad wire from the alt. to the battery,,,, The wire I am talking about is the big red one that BOLTS to the back of the Alt. Trace it to look for any corrosion or damage.,,,,,,,,,,,,Good luck, Jamison. Also as a 99 cougar owner, Hi this is the reason, I had 4 alternators replaced before i found it. There is a 175amp fuse attached to a wire that leads to the starter from the alternator. It is located behind the engine on the passenger side, just slide your hand back there find the wire pull on it hard and it comes up where you can reach it. I replaced it with a 175amp fuse block from a car stereo shop for $10 and I haven't had a problem since.

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Q: Battery light flickers and when you run your headlights it stalls on a 99 mercury cougar what could this be?
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