I have a Garmin 660 that I use in motorhome. I plug it into my cigar lighter for power but, the other day, it stopped working. I can plug it into my RAM 1500 lighter and it works just fine. I also have a brake control that works just fine in the Ram but not in the coach. However, I have a lighter/USB device and my dashcam gets power just fine. I also can charge my phone using the lighter/USB device. I've checked all my fuses but, it I had a fuse problem, nothing should work. I'm getting 12V to the lighter and I've troubleshot this to death. My next option is to buy a new lighter but....BOTH of them will not power my Garmin. Any suggestions are very welcome. Thank you in advance.