To chase the wires you need to make sure that ALL power is removed. You can then use an extra length of with and an ohm meter. Disconnect the suspect wire at both ends, attach the extra length of wire to one side and drag the other side close enough to the other end and check continuity.
Goody Two Shoes and the Filthy Beast
2008 Chevy Silverado 2500HD
Duramax and Allison 6 speed
2012 Wildcat 282RKX
You can't make things idiot proof, you can only make them idiot resistant.