Adding Electric Brake Wiring To Second Axle On Tandem Trailer

Question

Question:

How to wire second trailer brakes to existing controller or first trailer brakes?

asked by: Brett B

0

Expert Reply:

Each brake magnet will have two wires exiting it. One wire would connect to the wire which carries the brake output signal from the tow vehicle. The other wire should be grounded to the trailer frame. There is no polarity on the brake magnets, so it doesn't matter which wire is grounded and which is connected to the brake circuit. You can use wire like part # 10-1-1 to complete the wiring for the brakes on your trailer.

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

0

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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

For your flat bed trailer, I recommend using 12 gauge wire like #12-1-1 at the minimum, but preferably 10 gauge wire like #10-1-1. Both of these wires are sold by the foot, so you can order the exact length you are needing. If you were to use a…

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Answer 3

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…

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Answer 4

Yes, you can jump the front axles brake output circuit to power the rear axle. Check out the picture I attached to see how most people do this.

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Answer 5

The 12-volt circuit which is generally located in the 1 o'clock position on the vehicle's 7-way trailer connector will be used to maintain a charge on the battery for your breakaway system. This is usually a black wire, but you will want to…

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Answer 6

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 7

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector…

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Answer 8

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 9

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 10

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 11

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Answer 12

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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Adding Electric Brake Wiring To Second Axle On Tandem Trailer

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