What Gauge Wire Should be Used to Wire Trailer Brakes

Question

Question:

Hi, etrailer recommends to using Deka 10-2 gauge wire for running electric brakes to a tandem axle trailer. If this is the case, why does 7-way harnesses with molded plugs only have 12 gauge wiring for the brakes? Tghanks,

asked by: Ray S

0

Expert Reply:

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. On a smaller trailer with a single axle of brakes 12 gauge wire would probably be enough. But for a longer tandem axle trailer I would recommend you run 10 gauge wire to all the assemblies just to minimize the amount of resistance that would be on the circuit.

Also, be sure to use clean metal surfaces for your grounding locations.

expert reply by: Jameson C

0

Mark C.

5/26/2025

Do you offer a 7 pin pigtail with 10g brake wire?

Jameson C.

5/26/2025

@MarkC The part # H20046 has 10 gauge wire on the ground and 12 volt accessory circuit. The brake output circuit is 12 gauge and the remaining circuits are 14. Would this work for you?

Answer 1

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…

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Answer 2

Hello Gilbert, thanks for reaching out. We do have brakes and hubs for Dexter 4,400 lb axles, but the sizing for these 4.4K axles can be funky depending when they were made. The best way to confirm what you need is with the casting number on the…

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Answer 3

Yes, 14 gauge wire seems too small. I would go with 10 or 12 gauge. For 10 gauge you can use #10-1-1 and for 12 gauge use #12-1-1. These wires are sold in increments of 1 foot. So if you needed 20 feet of wire you would enter 20 in the quantity box.…

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Answer 4

Hey Randy, good question. Yes, the TowSmart #TS85SR is 100% copper wire, not copper-clad aluminum. That’s a big deal for trailer wiring because copper carries current better, holds up to vibration, and resists corrosion a lot better over time. You’ll…

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Answer 5

I spoke with my contact at Tekonsha and he said you can use your Tekonsha brake controller in your 2015 Porsche Macan, however, there are no custom wiring adapters available for the Macan. They have not tested the P3 on the Macan, but it is probably…

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Answer 6

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 7

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 8

The best hitch for your 2023 Toyota Sienna is the etrailer Hitch item #e56RR. This 2" hitch is custom fit and bolts to your Sienna with included hardware. I have attached a couple of pictures below along with an installation video we did on a…

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Answer 9

Hello Boris, thanks for reaching out. In the case of the 2024 Toyota Sienna, all four of the hitches available are structurally, virtually identical. They all bolt on in the same location, they have similar side flanges, and the crosstube/receiver…

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Answer 10

That's a good question, and in order to use the Curt Echo Mobile Trailer Brake Controller #C51180, it requires simply the 12 volt, ground, and turn signals be connected to the 7-way on your truck. So you will need the 12 volt connected that you…

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Answer 11

The best hitch for a 2024 Toyota Sienna is the Curt item #C22UR. This hitch is custom fit and bolts to your Toyota with included hardware. It is a class III hitch with a 2" receiver that has a 3,500 lbs towing capacity and a 350 lbs maximum…

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Answer 12

Your bearing number combination is pretty rare but it actually matches 4,400 lb axle hubs like the Dexter part #8-407-5UC3-EZ. This will give you a hub/drum that has a 6 on 5-1/2 inch bolt pattern.

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What Gauge Wire Should be Used to Wire Trailer Brakes

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