My '09 RK came with a 7.5A fuse. The setup was an extension for a battery charger. I don't know why an inbound charger would be fuse rated at 7.5A. I up'd it to 15 Amp when I made an extension with a cigarette charger that I keep in my windsheild bag. When I am not on a trip, I take the whole thing off. I used it mainly for an electric pump for an air mattress while camping. Worked great.