Alternator Decision

[MR nova @#25]

I took my Old Alternator to the local autostore to get tested, they didn't have the proper connectors to test Them. Since everything else on the motor's new and or upgraded. I'm going to get new alternators. I have No idea what kind to get. Im using the Pertronix Flame Thrower Distributor. ( I'm almost done. ) Thanks in advance

 

[alldodge]

Testing the ALT is easy but first what motor (Merc, VP, OMC)?
Which ALT if you know?

 

[MR nova @#25]

Sorry about that. 1977ish ( Merc) Ford 302's, W/4 barrel carbs

 

[alldodge]

The boat came with a Motorola ALT, see link below for the alt. It is also the complete manual including wiring

http://boatinfo.no/lib/mercruiser/manuals/mercruiser2.html#/146