Well , folks , I like to think I can figure just about anything out , but I can find no reference to a purple wire in one of the 3 charging leads on a dura pro 2 on-board charger . – It’s really a moot point since the charger isn’t working right and is being replaced by a Noco , but I need to know why said purple wire was tapped into the engine harness on this boat . — I gots to know !! — Any and all theories and / or explanations will be gratefully accepted . — Thank you in advance for your replies . — Hoss