55 Amp 12V Marine Alternator with Serpentine Pulley for Mercruiser. Replaces 807652T. Internal Regulator. USCG, SAE J1171 Rated. Produced in an ISO Factory with long, quality history in marine industry. VERY solid piece. May also replace PH300-0015, AC155616, 3857813. Please check your particular application by part number. If you have doubts, please contact us with engine serial number and we will gladly help if we can.