B/R,You indicate that the issue comes when you crank the big motor. That takes a lot of energy out of a battery, for a short period. Ive seen this problem before, and it usually occurs when the cranking battery is too small. IF you have a 24 series cranking battery, Id bet you a MegaBass jerkbait that if you replace that battery with a 27 or better yet 30 series battery, you will solve your problem.Ive never owned a P4, but I have had PIIs, PIII, Cougars and Pumas, and Ive never, ever had this issue. My batteries(3 of them) are 30 series SCS 225 Trojans. I just dont think that BCB uses wire that is too small on the harnesses to the bow.Personally, Id look at the cranking battery as your source of the problem, first.Trying to help,Mike Whitten/Germantown, TN