This is a 24V Motor and only one Cable coming to the Front is being used the Red.. I have disconnected the White cable at the main boat Battery. I have found a breaker (red cable) coming off the Rear Battery pos post of the two Batteries on the left side (passenger side) ( 24V 40A) … There is a breaker between the batteries that is Shrink Tubed over and part of the Jumper between batteries does this also have to be replaced. If I am going to replace I would want to do all I need to.. is 50A the right choice.