Main breaker question??

[Dizzyfoot60]

I have a 2005 supra launch 21v. Love the boat!
The only issue I have is the 70 amp alternator is not
Doing the trick with three amps, two subs, four tower speaker
And six interior speakers. Yes I know I'm changing the alternator
Today to a 140 amp. I also hear I should change the main breaker also
Where is that located??? Thanks for the help!

[supraaddict]

My main breaker on my 04 22SSV is up under the dash behind the steering cable housing, it is a pain to get to unless you move all the wiring up out of the way.