We had a storm yesterday and lights went crazy flashing on and off for a second or two. It cratered my block the phone charger cord plugs into in the shop so I went in the house and got another and plugged it in. Walked behind boat and checked to see if new starting battery I�d just put in earlier that day was charged up yet. One bank on each 2 bank charger was red, saying check connections. Fuses were blown so I had to wait till this morning to hunt them down, drove all over as they weren�t stocked in auto parts stores. Both blew soon as installed, not plugged in just from battery. One side of each charger is toast. Minnkota tech said not repairable so I�m out 2 new ones. I asked if surge protectors would harm chargers and he said no. I�d have thought fuses would stop damage but I�ll have one on the new ones. I even double checked wiring on new battery but it�s good. The wires to each post are tied with wire ties so basically like one for each side. And it charged for hrs. before storm hit. Just a heads up as I�d never had this happen. May be a common thing but hopefully this saves one of you from losing one.

I would double check your ground rod connection to your electrical panel and make sure you have a good, tight connection.