I need a 90 amp alternator for the engine in my yacht. The engine is a Mitsubishi 1.7 diesel, converted by Vetus for marine applications, now 3 years old. It overheats when supplying 40 amps continuously to recharge the 300ah battery banks. Is there a Mitsubishi 90 amp model which is a direct-fit replacement for the 50 amp model? thank you