1987 Toyota Supra Cranks But wont start

dixie2525 · 10-26-2010, 09:48 PM

Ok heres some updated info on my problem child. Checked resistance in coil this morning and found it bad. Installed new coil that tested good. The security system doesnt seem to have anything to do with the problem at this time. Reset it with the door key as found in a post. With the key off and out I still have an engine light on. With the key on I have an engine light and alternator light on. I was checking some things in the fuse box behind the battery and found that the relay marked am2 is hot on both sides with relay pulled out and key turned off. What is AM1 and AM2?? Cant find anything in the Haynes manual that tells what it is. Unbolted fuse box and turned it over and removed bottom cover to see if anything was melted. All looked ok. Unwrapped the harness looking for bad places inthe wiring and found nothing. There seems to be a large white wire and a large black wire feeding the relay. Traced white one to the pos side of the battery and the black one to the stud on the alternator. The battery terminals have been replaced. Diagrams for the 87 in the manual are minimal. The diagram calls for a yellow wire to post on alternator but it has two black ones fused together and looks factory. Dont know about the white one to the battery. Is the terminal on the alternator supposed to be hot? There are three wires in a plug on the back and they look good. Still dont think I am getting fire past the coil. Hard to check by myself. There has got to be a short somewhere with the engine light on and the key off. I have already replaced the harness for the key switch. Didnt change anything though.

10-26-2010, 09:48 PM	#4
dixie2525 Stock Join Date: Oct 2010 Location: Alabama Posts: 2	Ok heres some updated info on my problem child. Checked resistance in coil this morning and found it bad. Installed new coil that tested good. The security system doesnt seem to have anything to do with the problem at this time. Reset it with the door key as found in a post. With the key off and out I still have an engine light on. With the key on I have an engine light and alternator light on. I was checking some things in the fuse box behind the battery and found that the relay marked am2 is hot on both sides with relay pulled out and key turned off. What is AM1 and AM2?? Cant find anything in the Haynes manual that tells what it is. Unbolted fuse box and turned it over and removed bottom cover to see if anything was melted. All looked ok. Unwrapped the harness looking for bad places inthe wiring and found nothing. There seems to be a large white wire and a large black wire feeding the relay. Traced white one to the pos side of the battery and the black one to the stud on the alternator. The battery terminals have been replaced. Diagrams for the 87 in the manual are minimal. The diagram calls for a yellow wire to post on alternator but it has two black ones fused together and looks factory. Dont know about the white one to the battery. Is the terminal on the alternator supposed to be hot? There are three wires in a plug on the back and they look good. Still dont think I am getting fire past the coil. Hard to check by myself. There has got to be a short somewhere with the engine light on and the key off. I have already replaced the harness for the key switch. Didnt change anything though. Last edited by dixie2525; 10-26-2010 at 09:52 PM.