clawlan

Any idea where to find wiring schematics online for a 90 GT?

mjr46

http://www.veryuseful.com/mustang/tech/engine/

clawlan

Thank you for your help.

mjr46

no problem

clawlan

Ok. I still cant get this figured out. I replaced the voltage regulator on the alternator and now my alternator seems to be working properly but my battery is still draining. When I disconnect the battery cables and test the impedance between them, I get about 3ohms. Does that seem right? Also, When I leave one cable connected and test the amp draw between the other cable and battery terminal, I cant get a reading on my DMM, just reads 0. All the other functions on it work so I don't think the meter is bad. Perhaps a fried alternator or ground cable?

Before I was having excessively high key-off drain and I was going to start pulling the fuses one by one to see where the excessive draw was coming from. But now, since I replaced the voltage reg (which was bad), I'm reading 0 draw which makes no sense.

Any ideas? I'm going crazy...

shelbyshelby

mjr46 is steering you correctly. Just to give you options, when I was mechanic, I often would use a test light between the battery cable and the post. It just gave me a quicker visual aid from almost anywhere around the car so I would not have to keep changing posiitions alot, (I clamped it to the battery post and let it stay lit while I worked). I always done this with the test lights that had bulbs, although the LED test lights may work also. with that much draw, it sounds like the alternater is keeping the field charged to me. You mentioned 2 plugs ins, but is there a red battery terminal located on the back of alternator that needs disconnected to test? I hate wiring gremlins too. Im sure you will find it soon.