chargerbandit

Battery is 1 year old, 55Ah and it had this problem since it was new... in an ideal situation I would try another battery when I get my hands on it.

I peeled back the insulation on the blue wire and the wires are great, I noticed when the wire is unplugged and ignition on it has 12v, as soon as I plug it onto the alternator it only has 1 volt?

Took off the blue wire, rigged up another wire on that terminal and touched the battery 12v wire that goes on the alternator and it works, guess there is a short in the blue wire since the car also started pretty rough until the car started charging, doesn't happen if I don't hook up the blue wire. Going to run a separate new switched 12v to the alternator and problem solved then.

So I am having this problem for a while now on my 1990 Favorit, when I start up the car the battery light stays on and the battery is not charging (approx 12v at the battery), as soon as I rev the engine up above like 3000rpm the light goes off and the battery starts charging (14v). I have just replaced the alternator with a new one and the problem is the same, any ideas? Grounds look fine.