I have my on board air wired to upfitter #1. Recently it stopped working. The light on the upfitter still lights up but the air compressordoes not turn on. Looking in the manual it shows fuse #44 (10A) is for the upfitters. I would think that each upfitter would have its own fuse since it is my understanding that switch #1 and 2 are rated for more amps than #3 and 4. If so, I am trying to figure out what fuse and location would go to upfitter #1. Thanks

 

 

Thanks for the link. So it looks like upfitter one is one of those funky ones in the engine compartment box. A 25AMP located at number 94. I'll check that out

 

That low profile 25 amp J case fuse was the problem. Changed it out and I'm back in business. FYI I went to several different parts stores to try to find it and none of them carried it. I finally was able to find it at AutoZone