Battery Disconnects For a 2020 GMC Sierra 3500 Diesel With Dual Batteries For Flat Towing

Question

Question:

What is the proper method for disconnecting the negative terminal with a dual battery set up on the current generation GM diesel trucks when flat towing? Obviously RM466 is not an option with diesels. Should we set up a manual disconnect for both negative terminals? Neither manuals for 2020 Or 2021 have any mention of what to do with dual batteries.

asked by: Riley S

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Expert Reply:

I reached out to our local GMC dealer and they assured me that since you are only removing the negative terminals they can be disconnected in any order and reconnected the same.

A Battery Disconnect Switch # SE73FR can be used to make disconnecting and reconnecting an easier process. As these are rated for up to 50 volts DC and 1,250 cranking amps they will be sufficient for your batteries.

expert reply by: Bud M

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Answer 1

To flat tow a 2024 GMC Sierra 2500 you will need the following parts: Tow Bar and Safety Chains - etrailer XHD Non-Binding Tow Bar for Direct-Connect Base Plate item #e84ZR Base Plate Kit - Roadmaster Direct-Connect Base Plate Kit - Removable Arms…

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Answer 2

I checked the manual and also reached out to Blue Ox to confirm this but found no notes and Blue Ox stated that the Blue Ox Base Plate Kit #BX1739 would be a compatible fit for your 2020 GMC Sierra 3500 (diesel). If you haven't picked out the…

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Answer 3

If your 2019 GMC Sierra 2500 is a 4x4 model with a two speed transfer case that has a N and a 4WD Lo setting, it can indeed be flat towed. 2WD vehicles will need to be trailer towed. If your truck is indeed capable of being flat towed, you'll…

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Answer 4

Yes, Blue Ox confirms that the Tow Bar Wiring Kit #BX8848 will work for the LED lights on your 2020 GMC Sierra 2500. Check out the video linked below for more details on this product. Note that to tow your 2020 GMC Sierra 2500, you also need a tow…

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Answer 5

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…

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Answer 6

You need one of the Roadmaster Battery Disconnect with Switch Kit #RM93MR (which is specific for diesel models) 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…

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Answer 7

The purpose of a battery disconnect is not meant to keep the batteries charged but to protect certain onboard electronics. In your vehicle's case, is meant to keep the Electric Parking Brake disconnected. If the battery is left connected, or the…

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Answer 8

Yes, this is a common question we've received about the Roadmaster Battery Disconnect with Switch for Towed Vehicle w/ Flat Tow Brake System #RM93MR. Vehicle owner's manuals say to disconnect the negative post while Roadmaster always says to…

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Answer 9

Hey Andrew! Yes, Furrion does have a Chill Cube model with a heat pump. This was actually just released for aftermarket sale. You will need a complete system to make the switch, new R32 units aren't backwards compatible with old R410A systems.…

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Answer 10

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 11

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 12

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Battery Disconnects For a 2020 GMC Sierra 3500 Diesel With Dual Batteries For Flat Towing

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