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Blue Ox Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas or Diesel
Blue Ox

Blue Ox Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas or Diesel

Part Number: BLU58HR
$201.52
Retail:$230.06
You Save: $28.54
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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 Blue Ox accessories and parts part number BLU58HR or order online at etrailer.com. Free expert support on all Blue Ox products. Great prices and Fastest Shipping for Blue Ox Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas or Diesel. Accessories and Parts reviews from real customers.
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  • Reviews (22)
  • Q & A (0)
  • Videos (2)
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Blue Ox Accessories and Parts - BLU58HR

  • Flat Tow Wiring Harness
  • Auto Battery Disconnect
  • Blue Ox

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
  • Rated at 275-amp constant duty and 1250-amp surge capability


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 gas or diesel engines


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.
  • 1 Battery disconnect is needed per battery - vehicles with 2 batteries will need 2 battery disconnects.


BX88443 Blue Ox Automatic Battery Disconnect Switch for Gas or Diesel Vehicles





Video of Blue Ox Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas or Diesel
Video Thumbnail Video Player Dialog

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Blue Ox Flat Tow Wiring Harness - Battery Disconnect - BLU58HR

Hello everybody, this is Jeff at etrailer.com. Today we're gonna take a look at this Blue Ox manual battery disconnect for a towed vehicle with a flat tow brake system. Now if you need to disconnect the battery to flat tow your vehicle, you're going to want this kit and the way you're gonna determine if your vehicle requires the battery to be disconnected for flat towing. We do recommend to consult owner's manual. Now this will include everything shown here on the table. It includes this on and off switch right here with the two 24-inch long, two gauge size battery cables.

Comes with this metal switch mounting bracket that you can actually mount in whatever position you need for your application. But it's designed to, this attaches to it. And again, it'll attach Whichever way you need. Comes with these two flex guard wire looms. Right here is a three inch long heat shrink tube.

Cover your connection when it's made. Cable ties, and then the hardware to install your switch to the mounting bracket. Now this also comes with a nice set of instructions you can see here. That'll actually describe how this all goes together and operates. This will work with almost any 12-volt battery.

It is designed to work with gas or diesel injuries. Now this kit itself allows you to disconnect your battery with just the turn of the knob. It's much safer and faster than doing it yourself while keeping your towing accessories charge, so it eliminates that inconvenience and danger of having to pull the battery cable. This will provide a positive current source for the breakaway switch and other accessories without draining the battery. And the way you can tell once this is hooked up, if you notice right now there's an arrow right up at the top.

Your battery is going straight across, but there's a green area that it's pointing to and it's telling you that it's on. So your battery is connected. All you have to do to disconnect it is turn it this way to the red. It's a red section over here and that arrow's pointing toward that. So that's telling you now it's disconnected. So it's very easy to tell you switch it up that way. It's pointing to the green, means it's connected, so it's an easy way. You can look right at it and tell if it's connected or disconnected. Now this is rated at 275 amps, constant-duty, 1,250 amps surge capability. A couple notes I wanna mention on this kit is when you do disconnect your battery, whether it's manually or with this automatic disconnect, it could affect your vehicle's electronics. So you might need to reset various electrical components in your vehicle following the use of this product. Now this is one battery disconnect. So if you have one battery on your vehicle, you'll need one of these. If you do have two batteries, you will need two battery disconnects. Again, you can see it's easiest just turning the knob, the connector, disconnect your battery. That's gonna do it for a look at this Blue Ox manual battery disconnect for tow vehicles with a flat tow brake system.

Customer Satisfaction Score:

Ratings & Reviews

4.7

22 reviews
Review sort icon
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.

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Installed it the day it came, all worked well.



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Easy to install



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Arrived quickly as usual



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Is what was represented. Instructions are horrible. Thank goodness there’s videos.



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Complete assembly. Reasonably easy install. Provides peace of mind!



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easy to install. works great.



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Great response and tracking system



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Fairly install, works perfectly.



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Very easy to deal with,fast shipping & the part was easy to install!!



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So easy to install, just wish the switch was metal instead of plastic.



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This seems extremely expensive for a switch and a few lengths of wire, until you look at a sea of cheap options on Amazon and read stories about various failures caused by switches/wiring that aren't up to the load of starting a car. I still think it's overpriced, but it's an excellent quality switch with a nice range of installation options. In my case we used adhesive to stick it to the cover of our fuse box on a 2026 Chevy Trailblazer, as there was no great location for the mounting bracket that wouldn't be in the way of something else. I also needed to supplement with a marine battery terminal connection to provide a way to connect it to the battery.



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I needed two extra pieces to accomplish my task of adapting the disconnect to my MB GLK350 that has a gremlin that causes the radiator fan to run for no particular reason and drains the battery. A mini post to connect the one end of the cable and a battery connector to connect the other cable to the battery. Mission accomplished.

Claire H. profile picture
Etrailer Expert

Claire H.

9/1/2026

I'm glad this was an easy solution to keep that gremlin at bay!


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See what our Experts say about this Blue Ox Accessories and Parts

  • Battery Disconnect Solution for 2017 GMC Sierra 2500 Diesel with Two Batteries
    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.
    view full answer...
  • Looking for the Replacement Knob for the Battery Disconnect
    Thanks for sending the photos Doug! I wasn't able to find a replacement knob by itself for your battery disconnect switch. The battery disconnect kits we carry, like the Blue Ox Battery Disconnect # BLU58HR, are complete assemblies. If you're open to replacing the entire switch, the Seaflo Battery Disconnect Switch # SE29VR would work for you. It has the same battery disconnect function, rated for RV use and can be mounted either recessed or on the surface. It's a durable replacement...
    view full answer...

Do you have a question about this Accessories and Part?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee John S
Video Edited:
John S
Employee Amanda K
Written by:
Amanda K
Employee Daniel M
Test Fit:
Daniel M

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