Originally Posted by bluemaruder001
Only thing now is I have no glow plugs, have power to the always hot side of the relay but nothing else, will try to jumper the 2 small posts to see if it is the relay or the PCM not telling the relay to energize. I hope its NOT the PCM
That is Not the way to test and could actually damage the PCM's semi conductor inside if you do that!
Disconnect Both of the sm wires from the GPR.
Key ON and you'll find one of them has 12v in it (connected, the both will)
Put the 12v wire Back ON the GPR
With a jumper, Ground the other, empty, terminal
You should hear/feel the solenoid throw when you ground that side because it completes the path to ground so current can flow through the coil, create a magnetic field, and close the contacts inside to energize the GPs.
If all that worked as it should the next step is to determine if the PCM is providing that path to ground.
Do this with a Meter only, put the red meter lead on the (+) of the battery and the black lead to the wire that came from the sm terminal you grounded (still disconnected). When cold, and the GPS should be coming on, you should find 12v flowing through the meter as the PCM tries to create that same magnetic field to energize the solenoid.
If you don't
find that then it could be a couple of things besides the PCM too...