This really does sounds like a fuse to me!! I tried wiring up my sub neon to the boot light :embarassed: and I blew the fuse twice, it will cut out your windows, central locking and interior lights etc.. Cant remember what number the fuse was, but it was one of the very small fuses (i think) check in your handbook which sould of come with car as it has a guide as to what fuses do what..