Weird thing I just noticed while doing a simple test... I charged my battery overnight. And this morning I had 13.74V on the battery. I had the same thing on pin #28 on the TCM...
Then I started the car and the voltage fell to 12.5 on the TCM.... and even lower after 30 seconds... fell to 12.1 I think...
I'll look at the alternator this morning... but there's clearly something wrong in loosing voltage when the car's running... ??
Might be a short sipping all the juice? Or the alternator is just gone... But, it seamed to charge the battery fine since I put the car back on the road a couple weeks ago.