Getting ready to attempt an amp install on my 2010 ultra limited. I am having iron cross audio put in the front and rear preamp outs on the stock radio, then running the rca outs to an amp in the tour pak. I am having trouble finding a good ground location. Is there a ground terminal toward the rear of the bike, or should I just make my own to the frame somewhere? ALso, am I correct that you can just tie in to the headlamp or the cig lighter for the remote turn on for the amp?