As you all might have guessed, there is nothing wrong with this alternator. Or the trans for that matter… I was going to just reach for the scanner, but why not look at the alternator enable (L terminal) input first with a GMM (graphical multimeter).

As you can see, every 3 seconds or so, the enable wire goes low and this of course causes the alternator to stop charging. I think it’s a safe bet that the PCM is in control of the enable circuit (L terminal). So lets look at some scan data….

Ready to replace something? Home James