I got an 88 mustang GT. I was having problems with it and my pump didnt wanna prime. My relay under my saet had power and the relay on the side panal on passanger side too. My inertia switch wasnt getting any power so we used a jump wire to trick the new fuel pump and it works. Question is. Would the WOT relay have anything to do with no power to the inertia switch and not letting the pump prime?
No sir, the WOT relay is for the A/C compressor clutch and what it does is turn off the A/C compressor at wide open throttle. If your under-seat fuel pump relay is indeed functioning properly, then you have a wiring open between the relay and the inertia switch.