I recently got a 1983 16 ft Invader with Volvo Penta 125A/270 that had been sitting for 4 years. Had the carb rebuilt, drained and put in fresh fuel and the engine and outdrive ran like a champ. However, after being out a couple of times, after coming back in and waiting for my turn to load, I couldn't get the boat started to move it from the dock to the trailer.<br /><br />I had no spark and we traced it down to the coil. It turned out not to be the coil but was actually the battery. We were only recieving 8 volts to the coil. I had put a car battery in and it appears that all the bouncing on the water must have shaken something loose. I put in a marine battery from Wal-Mart and it again runs like a champ.<br /><br />I have 2 questions. Does it make sense that a car battery because of the bouncing could have been the reason for not starting, even after it had started earlier in the day? Did I really need a 875 CCA battery that I could hardly lift, or would a 625 CCA been enough?
