I originally had a multiple wire alternator and tossed and put on a single wire. I simply put the yellow wire (bat) to the positive side of the starter solenoid. The battery keeps discharging. I had a local shop go thru and they claim that the alternator is only creating 8.4 max volts. So could it be bad?

Is there a test that I can do that while alternator is in truck? Im charging battery as we speak so after I get responses I will have at least a fully charged battery....Right now I charge....get about 5-6 starts then battery drops to 11volts....then wont kick over. Ive taken battery in a few times and they say is still good.

I have another question on electrical and A/c hook up...may be related...but will post on another thread...

thanks in advance!