A few days ago my '90 Dodge Ram would not crank right after I parked it. I switched fuel pumps because of it not turning on... Well, that wasn't the problem. The best solution I received was to run a wire from the fuse box to the tank. I don't know which wire is considered the hot wire in the picture below. Had someone tell me that the Blue/Yellow wire was it, but the word guess was involved in the sentence. Can someone guide me to the light on which wire is the hot wire? Thanks in advance.