Keeping electronics running and the battery charged on a boat depends on a healthy alternator, and Indmar-powered engines put unusually heavy demand on this component thanks to stereos, livewells, GPS units, and lighting all drawing power at once. This 150 Amp alternator is a Delco 11SI design cross-referenced to DELCO 8400013 and 8600002 and INDMAR 575014, so matching those stamped numbers against your old unit is the surest way to confirm fitment.

Specs: 12V, clockwise rotation, 6-groove S6 pulley (63mm OD), internal fan, internal regulation, and a 3-terminal connection.

Watch for dimming electronics, a battery that won't hold a charge, slow cranking, a low-voltage warning light, or whining from the alternator itself — all signs it's failing.

Installation: disconnect the battery first, photograph wiring and belt routing, swap the unit using factory mounting points, reconnect terminals to their original positions, set proper belt tension, then verify output reads 13.8–14.4V at the battery.

Don't wait for a dead battery on the water — confirm your OEM number and order this alternator from Denparts.ca today.