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Battery not charging- not alternator 200

I can't seem to keep this car running for more than a month at a time!

For the past few days my dash lights have been glowing dimly some of the time.

Not all of the dash lights but lights that shouldn't be on.

I suspected something was up with the alternator or battery.

Then today the car dies going down the road.

I put a new battery in and drive home.

Check the voltage at the battery with the car running and I only get 12 volts.

Swap in a known good alternator and... still 12 volts.

But now the dash lights are bright as can be (the ones that shouldn't even be on).

New alternator = bright dash lights but still no charging?

I read that I need to get into the instrument cluster and fix something with the wire going from the idiot light to the alternator but I'm not sure I get it.

Can anyone explain it to me?

Thanks!






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