After looking at the Cherokee link and learning that the fan should (theoretically) only draw 13-17 amps I decided to check the Fuse size. Turns out that the fuse is a 40 amp fuse. If the motor starts drawing more amps due to any other issues it may have (dirt, leaves, etc) it won't exceed the fuse capacity before it becomes too much for the wire. Looking at some wiring charts for 12v DC it isn't reccommended to even allow 40 amps on a 10 guage wire and at the 20-30 amp range the wire length shouldn't exceed 6-10 feet before too much loss will occur. It would be wise to use it seems at least an 8 gauge wire for this application.
To limit the overheating of the harness (and therefore melting) it may be worth a try to throw a 30 amp fuse in place of the 40 amp and hopefully the fuse will go before the wiring.
Mods: 2007 Commander 4.7L, QTII, OEM Towing Option, front tow hooks, 2.25" lift, rusty's 1/4" leveling spacer, Bilstein 5150 Rear Shocks, rear swaybars disconnected, 4xguard front skid plate, mopar steel engine skid, Defender Roof Rack, 265/70/R17 BFG KM2 M/Ts 1.5" wheel spacers from rough country ($59.99) , Yaesu FTm350 70 cm, 2meter 220 50 watt mobile radio , 5db gain mag mount antenna, Hella 500FF lights.
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