Pinging an old thread...
Removed an alarm from my 87' as well. From what I can tell 87-89's don't have the diode which I can't find either.
This is what I've done:
- verified the alternator is working after bringing back to rebuild shop, all spins well and works fine
- turned on ignition key with alternator out (no light) and then grounded the blue wire (light went on). So, that means it's making its way through the anti-theft control module correct for it to light up?
- Verified all fuses are good
- brand new ground strap to engine case behind alternator, new ground strap from transmission to body and also new wiring harness.. so all of these are good.
- bulb is good on back of gauge. I did an LED conversion but DIDN"T replace that bulb so it's still factory OEM bulb and works.. just won't go out.
- revved car up to see if that helped and nothing
- verified at battery while running that it isn't charging and still showing 12.2 while running on brand new battery which is fully charged.
- I have 12.7 volts to the red wire at the alternator when detached from alternator which is same voltage as charged battery up front so no drop.
Question: What can I test when the alternator is out or when it's connected but hanging out so I can still access leads to see what's happening...? I've searched all threads and no idea where to go at this point from testing..
Otherwise, I'm about to reinstall Alternator and start looking for other things which could be messed up from alarm removal, etc.. but figured before I do maybe there is some tests I can run with Alt still out to determine if wire communication is in order.
pic for reference of wiring
