Ok so I have a 21 ft venture from 1978, we went out this weekend and I couldn't get the outboard to crank so I ran the trolling motor when the wind died. After about 4 hours of running my battery was completely dead. So I am looking into creating a power supply to run more than just the trolling motor and outboard. Does anyone have a good diagram? I have no electrical system in this boat what so ever. I will be wiring a VHF radio, cd/radio, 4 speakers, GPS, and the motors. Can you guys help me at all? Any info would be greatly appreciated! Photos, diagrams, whatever. I wanted to use solar power to charge my battery banks but I'm all new to this boat thing. I have don't plenty of car working before.