150 mercury 4 stroke outboard. Started fine drove up to 3000 rpm then cruised at another 2000-2500 for 30 minutes. Just turned it off, and when it was to be restarted it had no power the trim didn’t even have power. Used a battery booster pack had to leave it connected to drive the boat to shore, as soon as the ground was removed the boat died. So a new battery was put in, only 650~cc (I know it’s should be 1000)
Drove it up 3000 + rpms and as it was slowing down it died completely no power as well as no power to the trim. Boosted it and pulled it out of the water tested the alternator, checked battery cables, wires nothing seems out, or corrode or loose. going to change spark plugs and try it in water again. Could it be the alternator? I tested it with an ohm meter like the service manual says and the battery before start is 12v and when running draws 11.6v isn’t it supposed to stay equal or higher on volt meter, can this mean there a fault with alternator diodes or rectifier, I’m ready to pull the alternator and take it in for a check. Any input on this might be helpful
Drove it up 3000 + rpms and as it was slowing down it died completely no power as well as no power to the trim. Boosted it and pulled it out of the water tested the alternator, checked battery cables, wires nothing seems out, or corrode or loose. going to change spark plugs and try it in water again. Could it be the alternator? I tested it with an ohm meter like the service manual says and the battery before start is 12v and when running draws 11.6v isn’t it supposed to stay equal or higher on volt meter, can this mean there a fault with alternator diodes or rectifier, I’m ready to pull the alternator and take it in for a check. Any input on this might be helpful
