Wiring Brakes On Tandem Axle Trailer

Question

Question:

Can you please direct me to a diagram on how to wire brakes on tandem axels

asked by: Ben

1

Helpful Expert Reply:

Typically trailer wiring is color coded. The brake circuit is usually a blue wire which travels to each brake magnet, where it is attached to one wire from each brake magnet. The other wire from each brake magnet will ground to the trailer frame. I have attached a drawing that shows how the wiring is typically run for brakes on a trailer. I have also attached a link to trailer wiring diagrams that may help.

expert reply by: Jeffrey L

1

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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

You are super close to having the brakes functional on your trailer. Run the blue wire from the brake output pin to either one of the wires that are coming off of the brake assemblies and then ground the other and you'll be done. Brake magnet…

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Answer 3

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 4

It seems like you have the standard 6-1/2" long oval trailer tail lights based on the photo and dimensions provided. Therefore I'd recommend upgrading to the Optronics Fleet LED Trailer Tail Lights part #TLL12RK since this would give you a…

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Answer 5

Your easiest solution would be to replace your axles, we don't carry any brake assemblies that will bolt up to a 4 on 3 inch bolt pattern so you would be looking at either replacing the spindles on your trailer which would be kind of a pain, or…

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Answer 6

The recommended lug nut torque for your 7,000lb axle depends on a few factors like wheel size, stud size etc. Check out the attached photo which shows the torque specs for a variety of applications. I see you were looking at the Dexter Nev-R-Adjust…

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Answer 7

To check the pins on the vehicle side 7-Way, you can use a circuit tester or the volt meter. The circuit tester will show you if a signal is coming through on the pin you are testing while the volt meter will tell you that and how much voltage is…

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Answer 8

Figuring out what color wire goes to what function is sometimes quite confusing. I have attached a diagram which covers both the most common wire colors designated for a seven pin trailer connector and a seven pin vehicle connector, referencing the…

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Answer 9

The studs on the Dexter 7 inc brake assembly, part #23-47, are 1-1/4 inch long with 7/16 - 20 threads. Brake Assembly mounting bolt, part #7-75, is 1-1/4 inch long with 7/16 - 20 threads. The nuts, part #6-17, are also 7/16 - 20. This size is pretty…

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Answer 10

You can select your new hubs by matching up your axle weight rating, wheel bolt pattern and the bearings used in your current hubs. Based on my research your hubs are 10 x 2-1/4-inches, are from a 3500-lb axle and have the 5-on-4-1/2 bolt pattern. If…

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Answer 11

There are a lot of great solutions to your problem, but to upgrade your trailer axles from 6,000 lbs to 7,000 lbs, you need to replace your axles entirely. Adding higher capacity hubs alone won't change the weight capacity of your axles. Note…

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Answer 12

The pilot diameter on a wheel, like the one with part #AM30620, is the diameter of the bigger hole that is directly in the middle of the wheel. The pilot hole diameter of the wheel for the part I just measured is 2.84". I have attached a picture…

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Wiring Brakes On Tandem Axle Trailer

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