Does Curt 4-Way C56040 For Subaru Allow Installation of Brake Controller

Question

Question:

Which wire on the CURT 56040 Vehicle-Side Custom 4-Pin Trailer Wiring Harness is the brake signal wire to connect a brake controller signal wire to? Thanks!

asked by: Joe G

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Expert Reply:

So the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56040 is just a 4-way, which means it only powers your trailer's turn signals, brake lights, and tail lights (the other wire is a ground wire).

In order to add a brake controller you would also need the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat # ETBC7.

The Curt 4-Way # C56040 will plug into the 7-way that comes with the # ETBC7, and it is the 7-way that has the wiring needed to connect a brake controller such as the Tekonsha Prodigy P3 # 90195.

I have added links below to come help articles on brake controllers and wiring for you to check out if you want to take a look.

expert reply by: Kyle S

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Answer 1

Hey Brittany, That is a very good question, and for your 2022 Subaru Crosstrek I would definitely go with the Tekonsha T-One Vehicle Wiring Harness #118467. Tekonsha has proven to be the most reliable over time, and the fact it doesn't have a…

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Answer 2

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 3

The CURT Wiring Harness, #C56040, does have a separate ground wire that needs to be attached to a clean bare metal surface using the including self-tapping screw. The Tow Ready Custom Fit Vehicle Wiring, #118467, grounds through the connector that…

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Answer 4

After speaking with my contact at Curt, he said that they felt that the ground used for the vehicle's taillights may not be sufficient on the newer vehicle's and could cause the Wiring Harness, #C56040, to not function properly. In an effort…

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Answer 5

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 6

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 7

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 8

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 9

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 10

Hi David! There are quite a few hitches offered for your 2026 Honda Odyssey, so I definitely understand wanting to know the differences. There are basically three styles available for you and I have them broken out below: Exposed Crosstube: etrailer…

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Answer 11

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 12

Hey Ricardo! Yes, the Curt Trailer Hitch Receiver #C82RJ is the hitch Curt is working on for the new 2027 Telluride. This is a pre-order since Curt hasn't finished the design. It does not include wiring. The wiring harness for the 2027 is also up…

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Does Curt 4-Way C56040 For Subaru Allow Installation of Brake Controller

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