Originally Posted by Too Stroked

I think you're going to find that if you go the splice route, you'll actually have to make at least two splices per wire. That's because if you attempt to splice where the wires are currently broken, you'll end up with a wad of butt connectors right were the harness needs to flex. As you might guess, that's not going to end well.

Staying on the splice theme, that would mean you need to (somehow) have a virgin length of wire at the flex point for each broken wire. That would require an upstream splice to a new section of wire, followed by a downstream splice. That's an awful lot of work that will add a decent amount of resistance. Oh, and you really should replace the unbroken wires too since they're probably not far behind on breaking.

One other thought. Are you sure that friction really caused the breakages? It almost looks like something got in there and was nibbling on them. Mice can get in some really weird and cramped spots. Just a thought.

I'd recommend either attempting to source a harness from a junkyard or biting the bullet and getting a new one.