[klm2500hd]

I'll try my best to explain everything-
This is on a 1984 944 n/a. Other than the following problem everything works as it should i.e. low speed works, fans turn on and shut off when they should, fans work with A/C turned on, etc.

-Plastic part of fuse for driver's side is melting, actual fuse portion stays intact fuse feels hot when fans are running

-Contacts in fuse block have been cleaned, not a resistance issue.
-Swapped out fan for known good fan and also a new fan, still happens

-Put original fan on passenger side, problem stays on driver's side, so that rules out the fans themselves.

-pulled fuse out, checked for continuity to ground, none there. wiggled full lenghth of wire harness while checking for continuity to see if it was happening when going over bumps, no continuity.

-With the fuse pulled when the fans are supposed to be on, via thermoswitch or A/C, I get continuity to ground on the fused side of the fuse block (not constant 12V side). Unplug the harness from the fan and I do not get continuity with ground. Which leads me back to think it's a fan problem, but I've already ruled that out.

I'm at a loss for what's happening here, any ideas?