i have a 89 mercursier with two batteries and a manual switch for one two or all....both batteries are new and battery one works fine...starts right up no problems...number two is the problem...when i try and use battery two i get nothing...no power, no start no gauges..nothing...also if the engine is running on all or one and i switch to two the engine dies....i've checked the switch, fuses, cables, connections, etc...nothing seems wrong....any ideas???
