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Old 03-21-2019, 01:13 PM   #1
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GMC Canyon Diesel battery disconnect question

Hey guys. I've read through a ton of threads on here and on coloradocanyonfans but few people are flat towing a diesel and the battery disconnect requirements are different and I haven't found anything clear on what's being used by those who have one of the diesel twins. Ideally I'd like something that I can switch off from the cab but I'll settle for under the hood if I have to. I have a bunch of stuff running to the battery already so it's kind of a mess. Also I have an invisibrake so I need that to have power when the battery is disconnected. Can someone steer me in the right direction?

Thanks!
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Old 03-21-2019, 02:39 PM   #2
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I have a battery disconnect relay from Roadmaster on my Ford Edge. It is wired so that when it sees 12V on the charge line fro the MH it disconnects the battery. The power for my Brake Buddy comes from the Edge battery and the charge line keeps the Edge battery topped off. Has worked very well for us for several years.
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Old 03-21-2019, 04:15 PM   #3
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I have an ‘18 Canyon and use a simple knife blade cut-off on my negative terminal. However, I don’t need power for anything while I’m towing. There are a few guys on here that know quite a bit about what you need, Dutch Star Don and Vettenuts being a couple of them. Hopefully they’ll chime in soon.
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Old 03-21-2019, 06:38 PM   #4
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Quote:
Originally Posted by 890ken View Post
I have a battery disconnect relay from Roadmaster on my Ford Edge.
Unfortunately that doesn't work for diesels. Why RM doesn't make one for diesels is odd.
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Old 03-22-2019, 12:48 PM   #5
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I will not comment as I do not have the diesel.
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Old 03-22-2019, 11:30 PM   #6
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Quote:
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I will not comment as I do not have the diesel.
You just did? ...
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Old 03-23-2019, 07:40 AM   #7
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Old 03-24-2019, 03:33 PM   #8
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Ok, so after understanding a little more about this battery and how its wired, the solution was way easier than I was thinking. The positive post has all of my offroad lights, winch, brake system, etc wired to it. In the picture you can see the thick red wire thats above the post and not connected to anything, thats all that needs to be disconnected. when its connected that actually powers all of the car electronics. so 13m socket takes it off, wrap it up, then good to go. eventually ill figured out how to have a switch for that to run into the cab, but for now at least i dont have to do to much and everything works by just undoing that one cable.
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Old 03-24-2019, 04:25 PM   #9
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If the diesel has a single battery, then I would think the Roadmaster switch would solve your problem. Like others, I have the gas motor so am not sure what differences exist between the gas and diesel. Based on your photo, it looks just like my gas battery setup.
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