1990 vintage alternator, self-exciting or not?

Delta Ron

Member
Jun 4, 2019
43
California Delta
Boat Info
1990 350 express cruiser
Engines
Twin 454 mercruiser, hurth transmissions
Hi folks, our 1990 express cruiser has the 2 454's. I'm installing a new battery isolator, on the package it states "this isolator will not with self-exciting alternators. My question is, do i have self-exciting alternators on our boat?? I put new alternators on 2 years ago. I have pics of the old and new. From looking around, it appears most self exciting alternators have a rectangular socket for a plug with a couple wires to go into. These do not. Im pretty sure the terminal that says "ac tap" was never used. Hopefully someone out there is more alternator savy than I and can put some wind in my sails. Thanks in advance gents. Ron 20210712_115306.jpg 20210712_115300.jpg 20181028_185414.jpg
 

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