I recently bought a pontoon off someone. They had the lights radio and all accessories run to 1 battery and the engine ran to another battery. I cannot get the lights and accessories to work when hooked to their own battery. If I put them on the battery the engine is hooked to everything works. I know the battery is good I even tried another battery too. Anyone have any suggestions? Wiring isn't my thing. It just doesn't make sense to me the lights and accessories won't run off their own battery