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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
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$228.57
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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 (18)
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  • Used (1)

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

18 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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18
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See what our Experts say about this Roadmaster Accessories and Parts

  • 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...
    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 -...
    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...
  • 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...
  • 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...
    view full answer...
  • 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 64" Single Hook, Straight Safety Cables # RM-645 -Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-152-1676-7 -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...
  • 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...
    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...
    view full answer...
  • 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...
  • 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...
  • 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...
  • Will etrailer Invisible Base Plate Kit Fit 2016 GMC Sierra 1500
    Hey Richard! Yes, the etrailer Invisible Base Plate Kit # e98958 will fit your 2016 Sierra 1500. The same is true for the Roadmaster 4-Diode Universal Wiring Kit # RM-15267 and Roadmaster Battery Disconnect # RM93MR you ordered. Did you want a brake controller for your truck for trailer towing? The Redarc Tow-Pro Liberty # RED26CR is designed to activate trailer brakes but will not work for flat towing. If you need a brake system I recommend the Demco Stay-IN-Play Duo # DM86VR.
    view full answer...
  • Complete Flat Tow Set-Up for 2018 GMC Canyon Diesel Denali 4x4 Behind Diesel Pusher
    Hello Mark, Happy to get the flat tow components for your 2018 GMC Canyon Diesel Denali to flat tow behind your Diesel Pusher. I am going to include all parts, making sure to include the Roadmaster Nighthawk tow bars. - Base Plate: Roadmaster Direct-Connect Base Plate Kit - Removable Arms # RM-523182-5 - Tow Bar: Roadmaster Nighthawk # RM-676 (safety cables are included, cord from coach to towed vehicle, and 6 way socket for the front of your Canyon) - Wiring: Roadmaster Universal Hy-Power...
    view full answer...
  • Blule Ox Baseplate For A Diesel 2020 GMC Sierra 3500 Denali
    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 rest of your flat towing components then I have the following recommendations: Tow Bar: etrailer XHD Non-Binding Tow Bar for Blue Ox Base Plates # e67ZR. This tow bar includes safety cables so you won't have to purchase them separately. The head/shank...
    view full answer...
  • Recommended Parts to Flat Tow a 2024 Chevy Silverado 2500
    Yes, it can! To flat tow a 2024 Chevy Silverado 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 item # RM53GR Battery Disconnect - Roadmaster Battery Disconnect Switch item # RM-766 for gas or item # RM93MR for diesel Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit item # RM-15267 Supplemental...
    view full answer...
  • Parts Needed to Flat Tow 2022 GMC Sierra 1500 Elevation With Blue Ox Tow Bar
    Congrats on the new ride and we can definitely get your 2022 GMC Sierra 1500 Elevation ready to be flat towed, and since you already have the Blue Ox Ascent Tow Bar # BX4370 we can get your truck compatible Blue Ox base plates. There's a number of parts needed so I'll go ahead and list them out for you to make it easy. - Blue Ox Base Plate Kit # BLU35XR - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 - Blue Ox Patriot Portable Braking System # BLU37TR - 12 Volt...
    view full answer...
  • Recommended Parts to Flat Tow a 2024 GMC Sierra 2500
    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 item # RM33GR Battery Disconnect - Roadmaster Battery Disconnect Switch item # RM-766 for gas or item # RM93MR for diesel Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit item # RM-15267 Supplemental Braking System...
    view full answer...
  • All Parts Needed to Flat Tow 2023 Cadillac Escalade With Blue Ox Tow Bar
    Sure thing, and there are a number of other parts you'll need to flat tow your 2023 Cadillac Escalade with your Blue Ox Apollo Non-Binding Tow Bar # BX7470. Those parts include base plates, wiring, a battery disconnect, and a supplemental braking system. Please note there are differences in some parts depending on if your '23 Escalade has a gas or diesel engine, and also that base plates only fit 4WD models (there are no fits for 2WD models). I'll go ahead and list the parts out for you...
    view full answer...
  • Does Negative or Positive Battery Post Get Disconnected for Roadmaster Battery Disconnect
    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 disconnect the positive post. Since this is a Roadmaster product you'll want to install it according to their instructions. Please note this product is for diesel vehicles and if you're using a braking system that draws power off the battery you need...
    view full answer...
  • Recommended Blue Ox Base Plate for a 2019 GMC Sierra 1500
    No, it will not but I have one that does. For your 2019 GMC Sierra 1500 the correct one is the Blue Ox Base Plate Kit item # BLU35XR. The Blue Ox Base Plate Kit item # BX1716, you referenced, fits 2015 - 2020 Escalade's, Suburban's, Tahoe's, and Yukon's. Here are some other parts you will need to flat tow your 2019 GMC Sierra 1500: Tow Bar and Safety Chains - Blue Ox Alpha 2 Non-Binding Tow Bar item # BX7380 Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit item...
    view full answer...
  • What is the Difference Between your Roadmaster Battery Disconnect # RM93MR and Roadmaster's 767?
    The Roadmaster Battery Disconnect # RM93MR is the Roadmaster part number 767. This manual battery disconnect is designed primarily for diesel vehicles but can also be used on gasoline vehicles.
    view full answer...
  • Is it Required To Disconnect The Battery To Flat Tow a 2021 GMC Sierra 1500?
    According to the owners manual for your 2021 GMC Sierra 1500, disconnecting the battery is the only option to prevent the electric parking brake from activating when you flat tow your truck. We have the Battery Disconnect # RM-766 for gas engines or the Kit # RM93MR if you have a diesel engine. Your settings are saved in the computer memory and will remain set.
    view full answer...
  • Which Baseplate Kit For 2024 Chevy Colorado Works On ZR2 Model?
    Hey Chris, For your 2024 Chevy Colorado ZR2 you'll need to go with the Demco Baseplate Kit # DM27YV. As of right now (June 2024) Roadmaster does not make a base plate kit compatible with the ZR2 model of your truck. You'll still be able to use your Roadmaster tow bar by also picking up one of the below adapters depending on the model of your tow bar: If you have a Roadmaster Tracker, Falcon 2, Falcon All-Terrain, Blackhawk, Blackhawk All-Terrain, and Sterling tow bars with serial numbers...
    view full answer...


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

Condition: Installed

Notes: Item has been installed/test fit and some parts are still asssmebled together. Otherwise in good condition for its application.

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Info for this part was:

Employee Lindsey S
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Employee Chris R
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