Engine was running, turned headlight switch on engine stalled. control panel light not lite. have power on both sides of fuse. have power going into ignitioin switch.Took ignition switch apart for inspection, all looks fine. When power prob wire going from ignition switch all works fine when headlight switch is on. If headlight switch is off, even with added power nothing works. I basically have it down to a defective headlight switch or ignition switch, any thoughts?