we just put a brand new alternator and starter on our car the alternator still wont hold a charge its the third alternator we have put on.
we have a 1999 mercury cougar .the car kept gpoing dead so we replaced battery .still
went dead. so we replaced the alternator still dead.itll run acouple of days and then it
goes dead. the alternator wont hold charge.
I had the same problem in my 2003 Mustang v6. I got it diagnosed and the mechanic found that something in the car was pulling too much energy from the battery and was killing the alternator, the result was a car that wouldn't start. In the end I got new wiring and replaced the wire harness, after that I never had the problem again.
What is the battery voltage with the engine running? Have the mechanic talk a load reading on the alternator output with his clamp on amp meter.
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