Hello I’m working on my dads 1998 Sierra 5.0, I just replaced the longblock, and now it won’t start, doesn’t even crank. Followed gmc wiring diagram, and I’m not seeing 12v at the starter solenoid when the key is in the run position.
If I jump across switch side of the relay, the truck will crank. Indicating issue is on control side of relay. If I take a multimeter from b+ to the ground side of relay I see 12v indication good ground.
Seems like problem should be at the trans range switch, fuse 8 or at the ignition switch.
Ignition switch and lock cylinder have been replaced. Vehicle still not cranking.
Possibility of a security lock? The security light doesn’t stay illuminated.
Does anyone know the oem ground locations?
I’ll include picture of wiring diagrams I’ve found. Thanks for the help!
If I jump across switch side of the relay, the truck will crank. Indicating issue is on control side of relay. If I take a multimeter from b+ to the ground side of relay I see 12v indication good ground.
Seems like problem should be at the trans range switch, fuse 8 or at the ignition switch.
Ignition switch and lock cylinder have been replaced. Vehicle still not cranking.
Possibility of a security lock? The security light doesn’t stay illuminated.
Does anyone know the oem ground locations?
I’ll include picture of wiring diagrams I’ve found. Thanks for the help!
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