LS won't crank

[D-n-Tyke]

Originally Posted by 57FleetsideC4

Thank You. I looked at the one with the starter relay and it looks like the dark green wire becomes hot when in park or neutral so I think that part is good. What feeds that yellow/black wire is where my problem must be. Steve

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)