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Diagnosing electrical problems on a friends GN

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Scott87

Conscious guided
Joined
Jul 6, 2010
Messages
320
So I have a few questions. I have a long story but the questions will come first.

First question on the gm service manuals it shows some fusible links on power sourses for the fuel pump. If this is correct does anyone know offhand the location where the fusible link would be hiden??


The long story is helping my friend John get his 87 GN up and runing. His fuel pump isnt priming so I bought a new fuel relay incase his was kaput. The thing is the new relay didnt do anything. We used a test light on the wiring at the pump harness end and the priming voltages were a no go. We then jumpered out the relay with power from the AC relay and the pump kicks on and fuel pressure goes to 43lbs. We try to start the car and seems the injectors arent firing so wont start.

Toss a little starting fluid in through the old school smc alky nozzle and she fires up briefly. So we have fuel pressure and now no signal to tell the injectors to fire up. I think possibly even though we can get the pump to run we arent sending the voltage to the correct areas to fire off the injectors?


Thanks in advance,

Scott
 
Found the problem. John had replaced the battery and in doing so looks as if from time and it becoming brittle the wire broke inside the insulation leading from the battery to the ecm.

After jumping wires and checking all the color codes off the ECM we were about to jumper a wire from the battery the ecm when I inspected the wire near the battery and noticed the thinned out portion of the insulation showing the break.

The break was located between the connector and the battery terminal. There is what appears to be a black barrelled looking resistor. The break was pretty much abutted to the resistor. So cut it out, pig tailed it and she fired right back up. I guess the long end of it is KISS. :biggrin:
 
That black barrel is a fusible link. You should replace it with a inline fuse.
 
Thanks for the info. Will pass it along to John. Figure I would post again incase someone else had the same problem. Figure it would save someone some time diagnosing their own electrical gremlins.
 
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