Df70 won't start

[Dglmll]

2003 df 70. I put it in the water today and battery was really weak. Wouldn't start so I used a jumper battery still nothing. After trying to boost it I lost all power to motor. Trim wouldn't work anymore and no lights would come on when turning the key. I pulled the boat back to house and charged the battery still nothing. The fuse was blown going to the onboard battery charger but couldn't find any other blown fuses. Any help would be awsome

[Paulmat]

Df70 starting

I posted a similar post yesterday as well. Although the only difference my battery wasn't that bad. After I tried to jump it I couldn't get any power to system check or to trim. Just did some reading. I see there is a 30amp fuse that is always hot to the trim motor when battery master is on. I'm hoping that same fuse controls the starter circuit as well. That will be my 1st item I look at tomorrow. If I get it fixed I will try to remember to post it. Sorry I can't give you more info .