I have a 2006 Formula 34PC and my dedicated 6amp generator battery charger has failed. I am the second owner of the boat and the charger that came with (Guest ChargePro) failed and is directly wired in to the 120volt power source. But when looking for an identical replacement I can only find a model that has a three prong 120 volt plug. If I cut the plug off to direct wire the new charger I am told it will void the two year warranty. Has anyone else had a similar problem? If so, what model did you install? Thanks.