The following is puzzling me, looking for wisdom...

I have a 96 Cherokee 4.0 which has ~270k. Lately I have been dealing with overheating. Part of this issue is the auxilary electric fan is not working correctly, the truck has several wiring issues so this is no real suprise. To test it, I ran leads right to the battery, the fan runs fine that way, but that obviously leaves the fan running constantly. I thought I would run leads to the fuse block under the hood. I found an empty slot that was dead with ignition off, and tests 12v with the ignition on. I connected the fan directly to that slot, nothing, fan does not run. Then I tried tapping into my lights (I always drive lights on, so that would mean fan on when driving) fan still does not run.

Totally lost, why would the fan run direct to the battery, but not through the fuse block or known working wiring?

I would appreciate any wisdom.

Thanks,
Keith

quick bump

any help would be appreciated.

it's my daily driver, and with high temps outside, no dash gauges and the fan not working I'm afraid to drive it until I get it back to 100% for fear of blowing another radiator.

Keith