Towed the boat 2,300 miles. Put it in the water. It started right up, no signed of problems. 20 minute run to slip. Shut off engine. Replaced two tired deep cycle batteries with two new deep cycle batteries. In doing so, I accidentily touched positive lead to negative terminal on other battery. Tripped blue sea systems 7101 circuit breaker. Reset breaker. New batteries seem to be good. Have maintained old and new batteries with promariner pro sport 20 battery charger. With ignition switch on, And pre heat button depressed, I don’t have fuel lift pump, or starter when depressed. Throttle is in neutral. Also, I seem to have low voltage, 11.5 in the system. Lights for compass, fuel gauge are on all the time. Also, depth sounder operating all the time, and fuel gauge is reading and water temperature is pegged all the way over to the right. All this with perko duel battery bank switch turned off. This is a M-25-XPB universal engine in my Albin 25.