Thankyou for all the replies much appreciated it's great to get so much help and tbh it was because I'm looking at options for set ups for the new build Which will be a winch challenge truck, I'm thinking of having the battery for the engine, lights and such as the normal setup that is original 12v then adding a 24v alternator and running two 12v battery's in parrallel and having that set up for the winches would that work ? and running bow motors on the winches, I would like to have 12v motors on the winches as I'm told and have seen they can handle being over volted and work much faster , cheers