Tracker Boats Wiring Diagram | TackleReviewer Mar 30, 2010Wiring color diagram for Tracker and Bass Tracker boats. Use this as a reference when working on your boat wiring. Trailer Wiring Diagram. 139 COMMENTS. Corky March 27, 2016 At 12:47 pm . 12v outlet on a Tracker V18 combo is hooked to which battery? Trolling or engine starting battery? Reply. GEORGE F AELVOET April 15, 2020 At 9:05 pm . Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You The black battery wire should be same size as the white ground wire - 10 gauge in chart - faq311-7-way-trailer-diagram-rv_2_800 The picture below this chart shows correct wiring for RV plugs. As a professional RV transporter I have seen to many trucks wired with those 2 wires to small and cause a fire from overheating.