I'll look tonight to see which fuse it is.
Is your compressor running all the time?
If you have a leak in the line (probably before the first shock) the shocks will go down and the compressor will come on to compensate. I don't think is stays on long.
When I added new Monroe shocks I used the air lines that came with them and added air to them at a gas station and left the line from the compressor hanging. When I put a load in the car, the compressor came on for a minute or two, then stopped, it didn't keep running, but it tried once in a while till I unloaded the car. After that I hooked the compressor to the shocks like it's suppose to be. Sounds like you got a hole in the line. Also my switch is where yours is, but the compressor is under the left front bumper behind a panel. You can see the black air line running from there to the shocks. If I had to pay that kind of money for a new compressor, I'd just cut the wires to it and add a regular air shock fitting and pump it up at the gas station when I needed to carry something.
My son suggested I get rid of the switch in the back and add a switch in the car to the compressor so you can raise and lower it anytime you want. Poor man's air bags!