Problem with battery charging. I had the alternator replaced with a new bosch alternator. Seemed to work fine for a couple of days. Now when I start-up the car it charges OK. After it warms up the voltage slowly starts going down with no A/C or light on. If I turn it off and let it sit for a min. it starts putting out 13volts or so. It seems it has the same problem I had before except before I had it replaced it would not put out 13v for more than a couple of min. It seemed to be going bad. The battery is less than a year old. I pulled it out and had it tested at the local auto parts store. The guy said it was ok, a little weak. So I put it on a charger. Gave it a full charge then its fine for a day. After I turn on the A/C and lights voltage goes down between 13-12v. The voltage jumps around all the time, +/- .6v. I have the Durametric reader.
Any suggestions other than checking the terminal connections in the battery compartment?
Anyone had issues like this.
I was going to get a new battery but the old battery is still under warranty and I was pretty sure they would test it. It tested OK
02' C4s
TTKEN