Any help is appreciated. my car is not charging properly. i have checked all the grounds and got the alternator tested. the alternator put out 15 volts when tested but when i put ot back on the car it doesnt charge. what could the problem be? It a 87 ta with the 305 4 barrel

 

There are many different possible causes. Although I haven't quite finished locating my charging problem, what I did was search the 'electronics' forum and keep changing the keywords in the search box, such as "not charging", "bad ground", "volt gauge" etc. You'll find a ton of info. including other members input/horror stories and different remedies they have tried.

As a starter, here's some threads I've participated in and have helped me troubleshoot:


https://www.thirdgen.org/forums/elec...ge-issues.html

https://www.thirdgen.org/forums/elec...eadlights.html

https://www.thirdgen.org/forums/elec...uctuation.html

 

Ok ive replaced the alt and bat but now it seems like the alt voltage just mirfors the bat voltage. it does fine for a day or two then it just starts to die rapidly. i charge the bat and its good again for a couple days.