try changing the fuse?

no really, we need a little more info here. reread the entire install section of the FAQ. then try a couple of things. double check your wiring. easiest, if you have a multimeter, (or a maybe a 12 volt battery tester?) is check that the voltage of the always on line and the switched are 12 volts when they should be with respect to your ground. You can dismiss the amp remote line for now if you unit isn't booting up. I assume it works in the house, of course. those are quick things to check.

john