I rescently purchased a 1990 232 Gulfstream. The battery configuration raises question with me. I have twin Yamaha 150's , 2 batteries and 2 battery switches. I'm not sure what settings they need to be on while running, or docked using accessories etc... Lately, I'm experiencing a problem that my port engine wont start. I turn the key, dash gauges light up but engine will not turn over, just a click from the starter. With my starboard engine running only, my dash gauges do not work. When I then turn the port key, there is an interruption in power and it shuts down my GPS/FF but my dash gauges work. The starboard battery is low in charge but will not accept a charge. Is this a dead/weak battery or something more???