Instructions to Wire a Trailer for Electric Brakes

Question

Question:

I have a black and white wire coming from the brakes, I dont know where to plug them in the box to truck lead, color for color

asked by: Larry B

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Expert Reply:

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean metal surface on the trailer. I have included a diagram for you.

expert reply by: Leah S

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Haden S.

6/1/2020

W/ a 4 wire harness (green, yellow, brown & white). How do you wire the electric brakes from the junction box to the hubs? Which wires Tie together to get function? I have 2 green wires coming from the hub, a red & black wire coming from the axle to tie into the passenger side brakes & the white & black brake wire. How do these all tie together from the junction box to get the brakes to function?? Thank you.

Reply

Chris R.

6/4/2020

If you just have a 4-Way connector harness on the trailer this needs to be upgraded to a 7-Way so you can wire up the additional brake functions. I recommend using the etrailer Kit # e99011 for this application, which includes the junction box and new harness.

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Sam

5/26/2024

Hi Leah. Found this and it is super helpful. I just wanted to ask, my understanding is that there is no polarity as such with the electric trailer brakes. So any wire can be the ground. Can I ground any of the two to any suitable surface on the trailer frame?

Reply

Kevin C.

5/29/2024

@Sam Yes, either wire from a trailer brake assembly can be wired to power or ground, without issue.

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Answer 1

If your trailer has 7 wires running all the way back to the brakes, then yes, you can tap into the existing wiring. Each of your new brakes will have two wires for the brake magnet. One wire is for 12 volt power to the brake magnets and the other…

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Answer 2

Hi Todd, I do have a drill-powered A-frame jack for your enclosed trailer that meets all of your needs, and what I recommend for you is the Lippert Quick Drop Tongue Jack #LC733926. The #LC733926 just requires a 3/4" socket which you can use…

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Answer 3

The only difference between 7-Way Utility and 7-Way RV is the color of the wires. The pin outs are the exact same so either would work just fine with the other. If you check out the picture I attached you'll see that the functions are all the…

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Answer 4

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 5

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 6

I have a couple ways you can install the 7- and 4-Pole Trailer Connector Socket #HM40975 on your 2020 Ford F-150 with a 4-way flat factory connector. The first is going to be the easiest but is more costly. You will use the harness from the Curt…

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Answer 7

You can install a 7 way connector on your 2019 Ford F-150 by using the Curt T-Connector #C56413, which will plug into the factory supplied 4 way connector plug on your vehicle and give you a fully functioning 7 way connector. If you've got a…

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Answer 8

Hey Mark, thanks for all of the info you listed about your hub. With just that info we know that the hub/drum part #AKHD-655-35-EZ-K that you referenced is an exact replacement.

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Answer 9

Hey Anthony, It looks like there's a proprietary pigtail wire harness (p1072586) to connect to the factory plug behind the trim on the driver's side and the brake controller's wire harness. From what I can find some people say that…

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Answer 10

It sounds like you are asking what wire should be ground and which is power for installation of the Dexter Nev-R-Adjust Electric Trailer Brake Kit #23-458-459. The wires can be used for either, so if you want to use the black for ground you can, and…

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Answer 11

The difference between your 18x8.5-8 tire and the 18x8.5-10 is the size of the wheel; the 18x8.5-10 is going to have a 10" diameter wheel, which unless you had the available clearance and wanted to change all 4 wheel/tires is going to be too…

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Answer 12

If you are referring to two white wires from the brake magnet that are coming from the rear of each electric brake assembly, then it would not matter which wire is connected to ground and which wire is used for the brake feed. The magnet that…

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Instructions to Wire a Trailer for Electric Brakes

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