All,

I have a 1990 I've switched the alternator out twice.

problem: I disconnect the positive off the battery while car is running and the car dies.

I don't believe the alternator is charging the battery.

I get a voltage reading at the terminal on the alternator. I had a 96 alternator on think switching to a 90 alternator would fix the issue but it did not.

I get a voltage reading on the one of the plug wires the connect to the alternator.

question is is this common and I need to click on soon the ms3 pro. I can't find anything on this topic. I do believe the the alternator is internal controlled and not by the ECU.

is there something simple I am missing or is this a bigger issues.

I did check resistance touching the alternator casing and it appears good. All grounds are good.

any help is appreciated.

thank you.

 

Try using advance search. In the title use the word alternator.
There were many threads, including how to not blow them up and controlling with MS3