When looking for the #1 battery in your trolling motor series, it is the one with the red trolling motor wire hooked to the positive terminal.Good luck. You are about to embark on one of the great quests in the bass boat universe, the quest for interference removal. Many have tried and yet complete removal still eludes us…Please post here if any solution works.Bill Spence St. Albans, VT [url=mailto:billspence@yahoo.com]billspence@yahoo.com[/url] http://www.twinstatebassin.com Bass Cat Boats http://www.basscat.com Vexilar Marine Electronics http://www.vexilar.com