How to Disconnect the Battery on a 2021 GMC Sierra with Diesel Engine
Updated 02/25/2022 | Published 02/24/2022
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Question:
Which kit will allow me to get the vehicle set up to flat tow behind my motor coach? I have seen different kits and need to make sure I have what is correct.
asked by: Rick H
Helpful Expert Reply:
You are correct that the Roadmaster Automatic Battery Disconnect # RM-766 cannot be used with diesel engine vehicles like your GMC Sierra. The issue is the high compression ratio of diesels that cause the engine to surge up to 10 times that of gas engines, which can lead to failure on the solenoid.
What you can use instead is an alternate-style of battery disconnect like the Deka # DW05312 (uses a knob to attach and detach) or the Epicord # 277-000096. The Epicord # 277-000096 includes a switch you could mount inside the cab which would still allow you to easily disconnect the battery each time you're ready to tow your Sierra.
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Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas Only
- Accessories and Parts
- Flat Tow Wiring Harness
- Battery Disconnect
- Roadmaster
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Rick H.
2/24/2022
Which kit will allow me to get the vehicle set up to flat tow behind my motor coach? I have seen different kits and need to make sure I have what is correct.