Add a pigtail to the battery. It will be unswitched.
I use one of these mounted on the side panel.
http://www.powerlet.com/shop-by-product/socket-kits/SKTKIT
Yeah- my problem is i'm the only person in the known universe who doesn't use a battery tender, hence no leads. I just did some research and all these compressors are rated for 15 amps or more. I find it hard to believe they draw that much, maybe if they're pumping 80 or 90 lbs but otherwise.... Maybe i can just put in a larger fuse. Then i can be stranded with a flat tire and a fried fusebox- ha ha
mat
KEEP IT. Just buy the +/- sae cable used with battery tenders and bolt it to your battery post. Takes all of 5 min and will save you in the middle of the sticks.Maybe this has been covered before, but when you run any cable out of the battery area like this, or a GPS wire, etc., be sure you run it out of the upper right side of that metal plate that covers the battery. There is a small area where wires can run freely. Anywhere else and the wire gets pinched when you tighten up the plate bolts. Don't ask me how I know this.
http://ecx.images-amazon.com/images/I/41VwHgzEyjL._SL500_AA300_.jpg