I blew two circuit boards in my one mag 20. The cause was my fault. The little rubber boot the covers the switch had a crack in it. Water got into the switch and caused a short. Once I replaced the rubber boot, the problem went away. I just replace those riggers after 13 seasons of abuse. Those riggers saw a ton of stress dragging bottom for lakers with only the one rigger burning up 2 boards. The other two riggers were bullet proof.