Battery Disconnect Solution for 2017 GMC Sierra 2500 Diesel with Two Batteries
Updated 01/20/2026 | Published 01/13/2026
Question:
I need to isolate the 2 batteries on a 2017 GMC Duramax truck for flat towing. They have separate grounds in two different locations. I am considering installing a single disconnect between the positive bus and the two positive battery leads. Is this the best solution? How do your techs handle this? Thanks, Dan
asked by: Daniel A
Expert Reply:
Hey Dan, we usually install battery disconnects like the Blue Ox Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System # BLU58HR which provides an easy way to disconnect the battery. This works on diesel engines like what you have unlike some of these and also you'd need a quantity of two of these since you have two batteries.
Product Page this Question was Asked From
Blue Ox Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas or Diesel
- Accessories and Parts
- Flat Tow Wiring Harness
- Auto Battery Disconnect
- Blue Ox
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on Accessories and Parts
Dan
1/14/2026
Thank you for your reply, Dan