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The ARCO Premium Replacement Inboard Alternator is a 12V 55A unit with a 2-inch mounting foot and single-groove pulley, negative ground.
It covers OMC Cobra, Prestolite/Motorola and related Volvo Penta applications from one part number. Those engines shared alternator designs across manufacturers, so a single replacement serves several nameplates rather than needing a variant for each.
Negative ground is worth confirming on an older installation, since positive-ground systems existed on some vintage equipment. Connecting a negative-ground alternator into a positive-ground system destroys it immediately, and the mistake is easy to make on a boat of that era.
ARCO engineers its alternators for marine use rather than treating them as automotive substitutions. That distinction matters because an automotive alternator in a gasoline engine space lacks the ignition protection a marine unit is built with. Explore more marine alternators.
The ARCO Premium Replacement Inboard Alternator is a 12V 55A unit with a 2-inch mounting foot and single-groove pulley, negative ground.
It covers OMC Cobra, Prestolite/Motorola and related Volvo Penta applications from one part number. Those engines shared alternator designs across manufacturers, so a single replacement serves several nameplates rather than needing a variant for each.
Negative ground is worth confirming on an older installation, since positive-ground systems existed on some vintage equipment. Connecting a negative-ground alternator into a positive-ground system destroys it immediately, and the mistake is easy to make on a boat of that era.
ARCO engineers its alternators for marine use rather than treating them as automotive substitutions. That distinction matters because an automotive alternator in a gasoline engine space lacks the ignition protection a marine unit is built with. Explore more marine alternators.
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