I need some help understanding my sled's electrical system. I'm trying to wire my GPS directly to the sled's 12V system. I bought a 12V female accessory adapter, used the positive and ground from the tach's light bulb and wired it in. The accessory adapter that came with the GPS uses a .5 amp fuse which pops immediately, but the same fuse holds up fine in my truck. I figured that 12V was 12V, obviously the amps are regulated down somehow. The sled doesn't have electrical start, so what do I need to do, go to Radio Shack and buy a resistor of some kind?