I purchased and wasted my Money on many other types of Battery Disconnect switches but none worked on my Dual Battery equipped 2012 Silverado 3500HD. General Motors did not provide any space around Battery terminals that would accept any other cut-off switch only their own supplied terminal assembly. I was able to modify the Wirthco 20108 Knife-Blade T-4 Battery Disconnect Switches to overcome this space problem. One I installed on the drivers side in a horizontal switch actuation plane, the other had to be modified at the contact blade to open the switch without using the full stroke. Worked out Great.
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