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Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Diesel
Roadmaster

Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Diesel

Part Number: RM93MR
In Stock
$203.75
Retail:$230.51
You Save: $26.76
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If you need to disconnect the battery to flat tow your vehicle, you're going to want this kit. It disconnects your battery with the turn of a knob - much safer and faster than doing it yourself - while keeping your towing accessories charged. 1-800-940-8924 to order Roadmaster accessories and parts part number RM93MR or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Diesel. Accessories and Parts reviews from real customers.
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  • Reviews (20)
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Roadmaster Accessories and Parts - RM93MR

  • Flat Tow Wiring Harness
  • Battery Disconnect
  • Roadmaster

If you need to disconnect the battery to flat tow your vehicle, you're going to want this kit. It disconnects your battery with the turn of a knob - much safer and faster than doing it yourself - while keeping your towing accessories charged.


Features:

  • Disconnects your battery with the turn of a knob
  • Eliminates the inconvenience and danger of pulling your battery cable yourself
  • Provides a positive current source for the breakaway switch and other accessories without draining the battery
  • Includes a corrosion-resistant, marine-grade solenoid with 300-amp constant duty and 1000-amp surge
    • Comes pre-assembled for easy installation


Specs:

  • Application: vehicles that require the battery to be disconnected for flat towing - consult your owner's manual
    • Works with almost any 12V battery
    • Designed for diesel engine vehicles, but also work with gas engine vehicles


Notes:

  • Disconnecting the battery, whether manually or with this automatic disconnect, will affect your vehicle's electronics. You will need to reset various electrical components in your vehicle following use of this product.
  • A charge line kit (RM-156-25 - sold separately) is recommended if you have a braking system that is using power from the towed vehicle's battery while it is disconnected.
  • 1 Battery disconnect is needed per battery - vehicles with 2 batteries will need 2 battery disconnects.


767 Road Master Automatic Battery Disconnect Switch for Diesel Vehicles

Installation Details RM93MR Installation instructions


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.9

20 reviews
If you need to disconnect the battery to flat tow your vehicle, you're going to want this kit. It disconnects your battery with the turn of a knob - much safer and faster than doing it yourself - while keeping your towing accessories charged.

by:

Couldn’t flat tow without it. Easy to install. Looks great and is made really well.



by:

Arrived on time - have not installed ye t.

Cwm profile picture

Cwm

8/20/2025

After one year it’s working great. No problems



by:

Easy to set up works v ery well

Kelly profile picture

Kelly

4/20/2025

All is working great ??



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Works great exactly what I need



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See what our Experts say about this Roadmaster Accessories and Parts

  • Recommended Flat Tow Braking System for a 2022 Chevy Silverado 2500 and a 2026 Tiffin RV
    Hey Frank, congrats on the new motorhome! If your 2026 Tiffin on a Freightliner chassis came with the BrakeSync flat towing option, I recommend the Demco Air Force One Flat Tow Brake System item # DM23MV. This kit comes with everything you'll need to get your 2022 Chevy Silverado 2500 setup with a braking system. Please note that the BrakeSync system has a proprietary connector that looks like the picture attached below. You'll just need to plug the jumper cable/blue air hose included...
    view full answer...
  • Blue Ox Base Plates & Wiring For Flat Towing 2023 Chevy Equinox Behind Motorhome
    Hi there Eddie; thanks for the question and we can get your 2023 Chevy Equinox equipped with a Blue Ox base plate and the needed wiring so you can flat tow it behind your motorhome. There are a couple of options for the wiring depending on the type of lights you have, so I'll go ahead and list out what you need to make it easier to determine. Base Plate: Blue Ox Base Plate Kit # BX1730 Wiring (If you Have LED Tail Lights): Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable...
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  • Parts Needed to Flat Tow 2024 Chevrolet Silverado 1500 Trail Boss
    Hey Jimmy! I would be happy to help you get setup to flat tow your 2024 Chevy Silverado 1500 Trail Boss. You will need a tow bar, base plate kit, safety cables, wiring, and a supplemental braking system. I recommend the following: -Roadmaster Direct-Connect Base Plate Kit # RM86MR -Roadmaster Falcon 3HD Tow Bar # RM27NQ (Cover # RM-055-3 is optional) -Roadmaster 80" Hybrid Coiled-to-Straight Safety Cables # RM-674 -Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-152-1676-7 -Roadmaster...
    view full answer...
  • Recommended Flat Towing Parts for a 2020 Chevy Colorado ZR2
    Hey Ray, thanks for the information! To flat tow your 2020 Chevy Colorado ZR2 you will need the following parts: Tow Bar and Safety Chains - etrailer XHD Non-Binding Tow Bar item # e94ZR Baseplate Kit - etrailer Invisible Base Plate Kit item # e98966 Wiring Harness - Roadmaster 4-Diode Universal Wiring Kit item # RM-15267 Battery Disconnect - Roadmaster Battery Disconnect for Towed Vehicle item # RM-766 for a gas engine item # RM93MR for a diesel engine Supplemental Braking System...
    view full answer...
  • Recommended Flat Towing Parts for a 2026 Chevrolet Silverado 1500
    No, there is not Gary but congrats on the new truck! All of the baseplates for the 2026 Chevrolet Silverado 1500 replace the factory tow hooks and none of the manufacturers make a removable arm that can be used in replace of the tow hooks. The Blue Ox Base Plate Kit item # BLU24TR, you were looking at, is confirmed to fit the 2026 Chevrolet Silverado 1500 with the exception of the ZR2 models. This baseplate is compatible with Blue Ox tow bars and other manufacturer's like Roadmaster,...
    view full answer...
  • Best Full Flat Tow System For 2016 Chevy Colorado Z71
    Hey Eric, I can definitely help with that. I will start with a parts list then a few quick notes regarding your Colorado. Here is what I recommend: - etrailer Invisible Base Plate Kit - Removable Arms # e98966 - etrailer XHD Non-Binding Tow Bar - RV Mount - 2" Hitch - 10,500 lbs # e94ZR - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267 - Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Diesel # RM93MR -...
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  • Recommended Baseplate for a 2026 GMC Sierra 1500 w/a 3.0 Diesel Engine
    It sure does Bob and congrats on the new truck. The Curt Custom Base Plate Kit item # C66JR will indeed fit the 2026 GMC Sierra 1500 with a 3.0 diesel engine. The only models it doesn't fit for that year are the AT4X models with the AEV bumper. Here are the rest of the parts you will need to flat tow your 2026 GMC Sierra 1500: Tow Bar and Safety Chains - etrailer XHD Non-Binding Tow Bar for Blue Ox and Curt Base Plates item # e67ZR Wiring Harness - Roadmaster 4-Diode Universal Wiring...
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  • Complete Flat Tow Package for Chevy Spark LS Manual Transmission, or Tow Dolly for Automatic?
    Hello David, We definitely have some tow bars that will work for your Chevy Spark LS. I do not know of any that would stay on the front of your 2020 Chevy Spark, but they can stow on the back of the RV. If your Spark is an automatic transmission it cannot be flat towed, instead you will need the Roadmaster Tow Dolly with Electric Brakes - 4,250 lbs # RM-2050-1. If your Spark is a manual transmission this is the set-up I would go with for flat towing a 2020 Chevrolet Spark: - Base Plate:...
    view full answer...
  • Will a Baseplate on a 2018 GMC Sierra 2500 Work w/a Grille Guard?
    Hey Todd, thanks for the information! The Demco Classic Base Plate Kit item # DM9517321 is not going to be compatible with Westin HDX Grille Guards like item # 57-3790. All of the baseplates like item # BLU22QR and item # RM-3180-2 for your 2018 GMC Sierra 2500 install in the same location as well. You'll need to remove the grille guard permanently if you want to flat tow your truck. Here are the parts I recommend for flat towing your 2018 GMC Sierra 2500: Tow Bar and Safety Chains -...
    view full answer...
  • Battery Disconnect for 2007 Ford F-250 with Dual Batteries
    Hey Carlos, since your 2007 Ford F-250 that has two batteries is most likely a diesel engine you'd want to run two battery disconnect switches like the Roadmaster part # RM93MR which was designed for diesel engines like what you have that draw a lot more amperage to start the vehicle. How often do you flat tow the vehicle?
    view full answer...
  • Parts Needed to Flat Tow 2023 Chevy Silverado 1500 With Blue Ox Setup and Demco Air Force One
    Hey Joe! Do you have a base plate already or just the Blue Ox tow bar? If you need a base plate kit you can use the Blue Ox Base Plate Kit # BLU24TR. In addition to the Second Vehicle Kit for Demco Air Force One # SM99209 you will need the following: -Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-15267 -Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Diesel # RM93MR -Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 These...
    view full answer...
  • Recommended Flat Tow Wiring for a 2025 GMC Sierra 1500
    We sure do Howard! To control your 2025 GMC Sierra 1500's lights you'll need the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles item # RM-15267. This kit includes all the wiring, diodes, umbilical cable, and connectors needed to set your truck up to be flat towed behind a motorhome. Here are the rest of the parts you'll need to flat tow your 2025 GMC Sierra 1500, including some additional wiring requirements: Tow Bar and Safety Chains - etrailer XHD Non-Binding Tow Bar item...
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  • Braking and Electrical Parts Needed to Flat Tow a 2021 Chevrolet Colorado Gas or Diesel
    Hey, Glen! The best brake system for your 2021 Chevrolet Colorado is going to be the Demco Stay-IN-Play Duo Braking System part # DM86VR. Once installed it will make flat towing easy especially with the wireless monitor you will have with you in the front of the RV. I did go ahead and check into all the other electrical parts you will need to flat tow. If you have a gas model you will need the Roadmaster Battery Ace battery disconnect part # RM39ZT. However, if you have a diesel model...
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  • Best Flat Tow Package For 2019 GMC Canyon
    Hello Andy! Yes, I would be happy to put together a flat tow package for your 2019 GMC Canyon. Here is what I recommend: - Roadmaster Direct-Connect Base Plate Kit - Removable Arms # RM-523182-5 - Roadmaster Nighthawk All-Terrain Tow Bar w/ LED Lights - Non-Binding - RV Mount - 8,000 lbs # RM-676 - Roadmaster Universal Hy-Power Diode Wiring Kit # RM-152 - Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas Only # RM-766 - Demco Stay-IN-Play Duo Braking System...
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  • Parts Needed To Flat Tow 2016 Chevy Colorado LT 4WD
    Hello Brian, thanks for reaching out. We have everything you need to set your 2016 Chevy Colorado up for flat towing. I will do a full list of parts followed by a few important notes on your Colorado. Here is what I recommend: - etrailer Invisible Base Plate Kit - Removable Arms # e98966 - etrailer SD Non-Binding Tow Bar - RV Mount - 2" Hitch - 6,000 lbs # e34ZR - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267 - Roadmaster...
    view full answer...
  • Looking For The Base Plate And Wiring For My 2021 GMC Yukon Diesel
    Hey Justin, For your setup with the Blue ox tow bar you already have I recommend the Blue Ox base plate kit # BLU24XR. This is specifically for your diesel engine and works great with Blue Ox tow bars. Wiring wise I always recommend the Roadmaster # RM-15267 for your vehicle. It comes with a coiled 7 way to 6 way adapter chord to make the hookup to the motor home simple. I know you mentioned the base plate and tow bar but I will throw in some other parts in case you need those as...
    view full answer...
  • How to Install the Demco Air Force One Flat Tow Brake System on a 2025 Chevy Silverado 1500
    Hey Joe. We haven't had a chance to install the Demco Air Force One Flat Tow Brake System item # SM99243 on a 2025 Chevy Silverado 1500. I have attached a video below we made of this install being done on a 2023. If that doesn't answer your questions. I recommend reaching out directly to Demco for assistance. Another option is if you go to the product page of the Roadmaster Battery Disconnect item # RM93MR you purchased and scroll down below the pics on the left side you'll see a box...
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  • Parts Needed to Flat Tow 2022 GMC Canyon AT4 With Roadmaster Falcon 5250
    Hey Gerald! I would be happy to help you out with this. The correct base plate kit for the AT4 is the Roadmaster Direct-Connect Base Plate Kit # RM27MR. This will be compatible with your Falcon 5250. If you don't already have safety cables you will also want the # RM-643. The Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-15267 is the best wiring option for your truck. You will also need the Roadmaster Battery Disconnect # RM-766 or if you have a diesel the # RM93MR. If...
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  • Best Base Plate And Flat Tow Setup For 2025 Chevy Silverado 1500
    Hello David, thanks for reaching out. Both the Roadmaster base plates you mentioned, the # RM86MR and # RM76MR will fit the 2025 Chevy Silverado 1500LT. The difference is the # RM86MR is the direct connect base plate, while # RM76MR is the crossbar style base plate. The crossbar style is more of an old-school design that requires additional components. The direct connect # RM86MR is definitely what you will want to go with, and yes that will work great with the # RM-676 tow bar. That...
    view full answer...
  • Recommended Battery Disconnect for a 2024 GMC Denali 1500 Diesel
    Hey Michael congrats on the new truck! The most recent video I have of the Air Force One Flat Tow Brake System item # SM99243 being installed is on a 2020 Sierra 1500. I have linked this video below. Your 2024 is the same generation so it should be a similar installation process. The correct battery disconnect for your diesel 1500 Denali is the Roadmaster item # RM93MR.
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  • Recommended Flat Towing Parts for a 2024 GMC Sierra 3500
    I sure can! I checked with Blue Ox and their item # BLU97UR base plate kit has been confirmed to fit the 2024 GMC Sierra 3500 Denali. Please note that this is the only option Blue Ox has and these do have fixed arms that are not removable. Here are some other parts you will need to flat tow your 2024 GMC Sierra 3500: Tow Bar and Safety Chains - Blue Ox Avail Non-Binding Tow Bar item # BX7420 Battery Disconnect - Roadmaster Battery Disconnect Switch item # RM-766 for gas or item # RM93MR...
    view full answer...
  • Recommended Baseplate for a 2025 GMC Sierra 2500HD AT4X
    I sure do Lluis. For a 2025 GMC Sierra 2500HD AT4X, you'll need the Blue Ox Base Plate Kit item # BLU97UR. This baseplate does work with Blue Ox towbars, however it does not require the item # BX62-3470 you purchased last month. This baseplate kit attaches directly to a Blue Ox tow bar or adapter without any removable tabs. You referenced having other attachments so it sounds like this isn't your first flat tow experience. What other parts do you need for your new truck? You can add this...
    view full answer...
  • can 2025 GMC Sierra 1500 Tow Hooks Remain in Place with Base Plate Kit Installed?
    Hey Chris, thanks for reaching out - those are great questions! You will need a dedicated wiring harness for flat towing your 2025 GMC Sierra 1500, yes. I really like the Flexo-Coil Kit # RM-15267 because of how reliable it is, but if you don't already have a tow bar then I recommend pairing the Nighthawk All-Terrain Tow Bar # RM-676 with the Accessory Kit # RM-9284-2. You'll also need to disconnect your battery for flat towing so adding the Battery Disconnect Kit # RM93MR for each start...
    view full answer...
  • Best Flat Tow Setup For 2017 Chevy Colorado 4x4 Z71 Diesel
    Hello Shane, thanks for reaching out. I can absolutely provide a full list of parts for flat towing your 2017 Chevy Colorado 4x4 Z71 Diesel. Here is what I recommend: - etrailer Invisible Base Plate Kit - Removable Arms # e98966 - etrailer XHD Non-Binding Tow Bar - RV Mount - 2" Hitch - 10,500 lbs # e94ZR - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267 - Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System...
    view full answer...


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