it sounds as if you may have a bad pcm[computer] here....the ground is the green/white..you should get a ground signal on this wire from the pcm for 2 seconds when you first turn the key on,..and a constant ground when the engine is turning...,this activates the relay...the gray is the hot o the pump after it is activated..the orange is the hot to the relay...if you have a bad pcm,this may also be the reason for the light problem
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the green/white should be your ground from the computer..this activates the relay..other than the pcm,there is nothing else there exept the ignition switch,,that may cause this..you may want o check the wiring harness for damage
when the relay clicks on...it sould connect the orange and the gray...the orange is hot,,,the gray gos to the fuel pump........if it is making contact the the gray should be hot
i must admit..this makes little sense
sense the relay works sometimes when shaking/jaring it..the problem may be your power distribution center.[relay box]..i also dont understand why the computer is giving a hot on that wire,if the pcm is good..the head lights shouldnt have anything to do with this
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please tell me how and when the truck quit running??
the inline pump may not have enough pressure to start this truck,,it must have no less than 42psi at all times.........this sill puts me back to the pcm....you need to use a stock pump here
i would think the pcm is bad
yes..it is possible to have something shorting it out..you do need to check the wiring harness for damage...the pcm should be grounded when it is bolted in
yes,,it will help..it is not common for the ipdm to go bad in this model,,,strange,,,,i am glad you got it though