Were you applying 12 volts directly to the gps? GPS does not use 12 volts.I searched but couldn't find much help for my question, anyway. I was wanting to hookup a garmin gps to my 09' ultra. I first attempted hooking into the aux headlight connections with an older gps. I cut the cigar lighter plug off and spade connected to the aux wires. They were correctly hooked to neg and pos. Well I think it fried the gps. I then started reading up that there may be a transformer inside the cigar plug that takes the voltage down to 5v for the gps. True?? So if I can't cut off the cigar plug, how should I hardwire the gps up? Not true? Whats the best way to hardwire? Thanks for any help!