I bought my cut off switch at west marine I have two banks of batts so I use a switch that allows me to use either group or both and allows to to do a complete disconnect we do have a cut off switch installed by keystone but it does not cut all power to the trailer landing legs still work as well as a few other things so the other switch I installed worked better I leave our trailer unpluged between uses and get better batt life out of my batts
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