Look inside your boat outlet, there should be marked 30Amps or something different. As a general rule, if you have those computer plug, it's most likely to be a 15Amps plug, but certainly will not fit your boat requeriment. If you have a round 3 plug, it's a 30Amps. The 50Amps arrangement usualy uses a 4 pin. Pay attention if you have heavy loads installed (i.e. aircon). Look at WestMarine catalog (Marinco products) for pics and find one matching yours.
As a last tip, open a separated thread, this way more people would be reponding ... I'd recommend to open it at Gear&Maintenance section of Sailnet.
Beneteau Oceanis 43
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