I am having the same issue. If i bypass the starter relay truck starts right up so I am thinking neutral safety or ignition switch, but I am not sure how to go about testing eithert.
My 2003 5.3 won't start (from the key). The starter is about 3 months old, and it will run if I bypass the starter relay. I had these same issue in the past which is why I replaced the starter (turns out it wasn't it) but the truck eventually started working again after I cleaned terminals on...
So I fixed this issue on mine. It would click but not move. I removed the seat from the vehicle, disconnected the connector to the horizontal motor and potentometer right next to motor. I used an external 12v battery directly wired to seat motor (reverse polarity to change directions). I moved...
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