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Does 2020 GMC Sierra 3500 Need Two Battery Disconnects for Flat Towing  

Question:

2020 Gmc denali diesel truck with dual batteries. Would it require two battery disconnect switch or just one to be flat towed

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Expert Reply:

You need one of the Roadmaster Battery Disconnect with Switch Kit # RM-766 per starting battery on your 2020 GMC Sierra 3500.

So if only one of the batteries is a starting battery then you only need one, but if both are starting then you'll need two.

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Jon G

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