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What Battery Disconnect do You Recommend to Use with My 2020 GMC Sierra 2500?


Looking for a battery disconnect kit switch to install in my GMC 2500. Actually, 2 kits for 2 batteries. This is so I can tow this truck.


Expert Reply:

When you say you have 2 batteries, I am assuming you may have a diesel model. Even if this is the case, you still only need one battery disconnect kit. This is because batteries are wired together on a single system. If you use the disconnect on one battery, this automatically cuts off power to the second battery since the first one is not emitting power.

With that being said, the correct battery disconnect switch you need for your 2020 GMC Sierra 2500 is the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766.

I went ahead and attached an installation video of the # RM-766 being installed on a 2020 Sierra 1500. The process on your 2500 is nearly identical.

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