[57FleetsideC4]

Originally Posted by D-n-Tyke

Are you using the factory fuse box out of the donor vehicle? Or are you using a standalone fuse/relay block as part of the modified LS harness? Similar to this (https://lt1swap.com/fuseblock_obd2port.html)

This is modified factory harness and I found the problem. There is several wires that have to be connected to the truck to run. The purple start signal wire from the switch was corroded and broke inside the harness (I was poking around and the purple wire pulled out of the harness. Just had to solder the wires together and piece of shrink tube and all set. Thank You for the replys. Steve