I have an 86 Evinrude Vro 150, which I have been having difficulties starting. When I would crank the ignition, the motor sounds like it's trying to turn over, however it sounds like it loses power or has weak power. I then attached jumper cables to the battery, and after several attemtps, the engine started. After removing the cables, the engine started a few more times, and of course, when I went to take it out on the water, it would not start again. I then had the battery charged and checked, which it checked good, so I'm at a loss for where the problem is. I haven't done it yet, but I feel if I attach the jumper cables again, the engine would start. Where else should I look to troubleshoot.