Bill, Two years ago, I replaced my chargers for Mastervolt 60 amp and 100 amp. According to the specs for the 100 am charger a cable AWG2 is perfectly fine and thus it can be connected to the batteries with the standard cables of our boat. I would not spend the effort changing them. If you want to add extra safety you can connect in parallel the cables going for each of the two battery chargers. I kept the same cables of the original 30 and 60 amp charger cables for the 60 and 100 amp chargers without any problem.
