Looks like you've found the problem, Billy. My understanding is that the Amel 55 initially did not have this DC to DC charger, with the engine alternator being the sole charging source for the starter battery. This resulted in the starter batteries going bad when boats weren't moving for long periods - the specs for the AGM say that the self discharge rate is 3% per month. So you also might have a sulfated starter battery because it has been deep discharged many times and never been charged to 100% by the engine. Good luck with fixing your issue! Cheers Joerg
