My 245 has wires with cracked insulation going through the tailgate hinges, so I'm gonna have to splice good wires in there.

Has anyone done this before, and what pitfalls can I expect? It looks like I may have to remove each hinge independently to gain access enough to splice it. I'll try and find some of that flexible black wire tube/conduit to put around my new wires, but finding a small enough size to take those wires throught that limited space may be tough.

Any advice will be greatly appreciated.