New alternater is tripping circuit breaker on mercruiser motor

[Jmymarchvt]

I have a 2000 crown line with a 3.0 GM mercruiser. The belt broke after I tightened it and it appeared the alternater needed to be replaced I replaced the belt and alternater and the boat started fine but when I put it in the water and throttled up the circuit trips. The alternater is a new rebuilt unit. Any suggestions as to what is causing the circuit to trip. The battery was not charged but jumper box worked fine to start it.

 

[Don S]

Re: New alternater is tripping circuit breaker on mercruiser motor

The alternator shouldn't be charging through any circuit breakers.

If you broke a belt tightening it, then you have other issues with your belt, or you are just going crazy tight with it.