Hi We are just on our way home from 3 weeks in the north of WA and had to get the 2400 Yamaha out to charge the batteries no problems so far ,stared up and it runs perfectly , plug the cable in with only the battery charger creating any load and it starts to hunt or appears to be over loaded when in doubt check the manual but that gave me no clues. Can anyone help what the problem might be. Regards Reece