i dont think that will work. my engine is air cooled and off the altenator is a fan for cooling the engine. why wont 51amps work? its not a huge system only 800watt plus ill be running a big battery.its 2 10 kenwood subs and a 800watt amp. so its not a true 800watt. ill eb running 2 6x8s and 5.25s thats it