Does anyone know which part of the wiring harness this controls? 04 burb 5.3. Opened it for further inspection and 11 wires were chewed, truck cranks but never starts.

 

If me, I'd purchase some colored wires, disconnect battery, and use solder and shrink tubing to repair each wire. Or let a shop handle that (maybe even a stereo install shop). If lucky, other components will be OK.