Friend’s truck won’t start

well, swapping in wiring may be an issue, he'd need a wiring diagram etc. Also keep in mind if the wiring is totally screwed he may be shorting out parts like the ECM

hus wiring diagram is this multi year diagrams in Haynes/Chiltons.

i asked him this morning dud he actually run a jumper wire from the battery to the coil - no he DID NOT! He was checking with a test light at the coil. I told him he was getting goid advice and start with the jumper wire