one thing when you are checking your voltage make sure you have every thing on. ff.chart plotter, lights,raido wippers,main and trolling motors,bilge pump etc. that way if the voltage is high start tuning things off to see what circuit is bad and repair or if it is around 5.1 to 5.6 you have a pretty nurtrial boat I have the protroll and use it mostly to check the boats voltage and then set it to 6.4 to 6.6 it hasen't hurt but I look at it as another tool. also clean your zinks the ones on the boat and motors and don't forget the ones inside your motors before you test. dfly