[projectRDM]

Ignore all other answers and do this:

Jump the two large gauge wire in their own plug. Where ever it may be hidden, that's the one you need. Single plug, two wires only, both 12-10 gauge.

We all know where it should be but yours may have been cut off already or moved somewhere, no point in wasting more time trying to decipher where they are, just find them and connect them.