I was getting boat ready for lake wanted to make sure it started before loading, would not start checked spark at coil with screwdriver in coil wire could not see spark, checked it again a few minutes later, spark was present and engine fired over, I figured maybe first test of ignition spark was fluke, we took it to lake and all went well Friday no problem starting, Saturday morning while crossing lake the motor died abruptly like you turned off the switch, I had left the bilge pump on all night so battery was weak and didn't turn over long but motor would not restart was towed back to dock. when I got home and charged battery it started again, any advice would be appreciated