I have a 2012 TRI-Glide that I installed the factory splitter attachment on in the accessory plug under the seat. I am running a wiring harness under the tank to a terminal that has 3 cigarette lighter plugs and 2 USB ports. When I started using this I had no issues. I have an XM receiver plugged in with a cigarette plug adapter. The other day I went riding and when I hit the brakes, either hand or foot, the XM receiver dropped off line. I got back home and looked at the power LED on the terminal and everytime I hit the brakes the power light went out. When I move the plug to the faring cigarette outlet, everything is fine. ANY IDEAS. The accessory outlet is rated for 15 amps and im not even pulling 1 with the radio

 

Sound like you have your ground (negative) hooked to the wrong wire. The accessory plug under the seat has 4 wires.

Black - batt neg
orange/red - on with ignition
Red/yellow - brake
Orange - acc switch

Make sure your negative lead goes to the black wire or ground it to the battery -