Originally Posted by
Fritz129
It was the wiring. I replaced everything from the batteries back to the motor and all is now fine with the motor/starter.
the longer answer is I probably had a problem for a long time on the house side of my battery system, the first problem I had was I thought my cranking battery was on position One on the battery selector switch and the deep cycles on Two, they were actually reversed. A failed battery selector switch gave me the opportunity to realize that the inputs on the back side of my switch are on the opposite side. So for years I’ve been starting my boat on both, running to the reef then ignorantly switching to the cranking battery to run my bait pumps at anchor.
A partial failure of the battery selector switch finally exposed some long existing issues with corrosion and crimped wires. A great, and humbling learning experience.