APU fan not working

there's a fuse on control board that says PCF "primary cooling fan", the fan can easily pull more than the factory fuse rating on start up, (same for the *condenser* fan, the outside one), I've had a 20 amp fuse in place for PCF for ~3 years and it's been fine since then. i think the actual fan just finally died though cause PCF quit coming on and fuses are all still good. 15k hours is a decent lifespan, half of that was with zero protection from salt/sand/dust/snow/water without the cover. it would run fine up to about 90 degrees ambient before it would shut down for coolant temp, if you run it with the cover open the PCF isn't really necessary. but i think it baked the alternator cause now running the tripac takes more juice than it creates until the truck low voltage trips, time to throw some $$$$$$ at this beesh

 

I had this issue today. In Phoenix never had this happen before. Ran fine I thought the ac compressor stayed on too long or maybe lost some coolant when ENG showed on my controller. I have the old style tripac. It tripped the reset breaker or switch and I reset it and started and ran a couple minutes and tripped again. This happened another couple times and I pulled some fuses and checked and they're all good. It's going now with the compressor just staying on with temp set at 73 in the bunk. Noticed the cooling or radiator fan for apu isn't coming on though. I'm missing the cover that identities what fuses are what for the fuse box of the apu. Does anybody happen to know where to find one?

I did notice a little blue spark on some fuses when the blades would hit the fuse terminals putting the fuses back in. Not sure if that means anything. I'm mechanically stupid. Not being modest.

 

I foundadid my problem. It was the wire with the inline 5amp fuse in battery box. Can't seem to get the dang butt connector tight enough or something. But redid the connection yet again and so far so good. FYI, that wire WILL cause you hell if or when you have problems with it. Got out and wiggled the connector on that wire (butt connector) after it threw ENG code again and I reset the breaker. Ticked it's ### off like a dead battery again. That's how I figured that was the culprit.

 

Did that sensor fix it?