Man, they put fuses all over the place in motorhomes because RVs are built by knuckle draggging, window licking, helmet wearing, bugger eating morons. In the aviation business, we'd shoot the lot of them and then go have lunch. But it's likley not the fuse. I bet it's a low pressure in the system. Get yourself a can of recharge from Napa, or Autozone or WalMart and put some in. A 2003 probably neeeds some recharge. Follow the simple instructions on the can; shake can, hook it up to the only fitting it will go on, squeeze the trigger and shake the can as you fill. Put some in and go look at your compressor. If it's turning, you're golden. My Monaco took a few big cans because the system was not charged at the factory. And the rep says "Oh, the dash air doesn't work well anyway." It does if you charge it, but I should have vac'd mine down first.
2006 Monaco Safari Cheetah 40PMT