News Flash ! all is well and the fish don't stand a chance! We have been running the boat on A or B and not both and never change when under power with great results! As always, I find time to review other post and I have to ask this, Do you have to come to the Neg. on both battery with the lead or can you ground each? Both of mine go to ground after inspection yesterday and I was thinking that it might have been part of the issue? so to be clear let me say this, battery A Pos. to switch A neg to ground / Battery B Pos to switch B Neg. to ground. If I need to have a jumper I will put one across, but after looking at other postings, I know that mine is not wired that way. Thanks for the input and I would like to add, we are running 11.5 at idle and 14.5 with just a bump on the throttle, checked it at the Helm with meter and found the dash off by a hair. and only spent $65.00 to have it rebuilt! so to the others, look for a good rebuild shop- spend the time not the money!