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I will prefer to isolate this out. To confirm, the reverse lights are resolved, correct?
Now you are only focused on the no start, correct?
I want to start from the top. No wait to start, CEL does come on indicating power to PCM so that is ruled out. The issue is clearly in the glow plug circuit. You found the 2 different relays on the top of the engine with the one towards front and driver being the glow plug relay and the one towards rear and passenger being the fuel system relay. We have that established.
You have power on the small wire but still wait to start. This may sound crazy, but have you pulled the cluster and changed the buld for the wait to start light? If not, do that because that bulb being bad will cause the ground to not close and the neigne to not start. You have no idea how many times I have chased that issue to be a stupid bulb. So check that and get it ruled out of the way and let me know the result of where you are at.
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