Brake Controller Recommendation for a 2023 Mazda CX-50 with OEM 7-Way Harness

Question

Question:

Im trying to find out about a brake controller for the 2023 Mazda CX-50. I have the Mazda 3500# hitch and Mazda 7 pin wiring harness options. The schematic for the 7 pin plug shows a brake wire but dealer has not been responsive at all about a brake controller. The ONLY thing I could find is a brief mention in a review While our trailers all used surge brakes, the CX-50 is pre-wired for an electric trailer brake controller under the dashboard. Can you help with information on installing a brake controller yet? I would prefer a wired controller over the Curt or equivalent remote version. Plus Im also not sure 30 amps is available at Mazda 7 way trailer socket. Thanks!

asked by: Mark T

0

Expert Reply:

- SEE SOLUTION UPDATE WITH PART # C32FV IN COMMENT SECTION BELOW -

I have a brake controller recommendation but at this time it doesn't look like we (or our manufacturers) have any information or at least an adapter harness to fit with the wiring you have under the dashboard on your 2023 Mazda CX-50.

I recommend checking out the Redarc Tow-Pro Elite # RED44FR for your application because the only part of the controller that will be visible is the small control knob - this not only gives you multiple mounting location choices but it also gives you more space inside your CX-50. You'll need to install the controller by splicing into your OEM harness, connecting the following wires from the controller to the following functions:

Blue - 7-Way Output to Trailer
Black - 12V Power
White - Ground
Red - COLD Side of Stop Light Switch (only gets hot when brake pedal is pressed)

If the 7-Way on your CX-50 is prewired from the factory then it should have sufficient power and safety parts in place (like fuses and circuit breakers) for you to be able to tow safely.

Attached is a review video for you to check out.

expert reply by: Jon G

0

Alex M.

4/26/2024

Is there any update for this question? I do not feel comfortable splicing into the OEM harness. I have a 2024 Mazda CX-50 with OEM 7-way harness.

Reply

Jon G.

4/29/2024

@AlexM We do have a custom adapter with the Curt # C32FV that works with your 2024 Mazda CX-50. You can either use with the Redarc Tow-Pro Elite # RED44FR (by cutting off the black side of the adapter and splicing it to the Redarc pigtail) or I recommend checking out the Curt Echo Under-Dash # C27JR which plugs into the same adapter and syncs up to an app on your phone to control the brakes. The controller mounts under your dash like the name implies so the inside of your cab stays clutter-free!

Reply

Reversed W.

10/15/2024

I purchased this adapter. my 2024 Mazda Cx50 factory brake controller plug has red, YELLOW, black and white wires. The Curt has red, BLUE, black and white. Only one in four wires in the pigtail match to the slots/colors in the factory receptacle. I am going to re-pin it so red to red, black to black, white to white, and Mazda yellow to Curt blue. Is this correct?

Reply

Jon G.

10/16/2024

@ReversedW No, that is not correct. The factory wiring on your 2024 Mazda CX-50 will be using different colored wiring, but the functions should match this OEM plug. The wire colors for the Curt match with the following functions: Blue - 7-Way Output to Trailer Black - 12V Power White - Ground Red - COLD Side of Stop Light Switch (only gets hot when brake pedal is pressed) You can use a circuit tester to verify the functions and pinout on your Mazda - I don't recommend swapping the pins around on the adapter until you've verified that the functions are incorrect. If you do find that they are incorrect please let me know so I can look into it more as well.

Reply

Devo

7/8/2025

@JonG I have a 2025 CX-50 with factory tow hitch, which has the prewired connector under the dash for connecting to the brake controller. I have read on a CX-50 forum post from July 2024 that the wiring adapter (part number C32FV, I think) supplied with the Curt brake controller should be plug and play, but it had the pins reversed, so they had to swap them around. Can you tell me if this has been fixed by now, or whether I would need to do the same thing? If they do need to be swapped, is it possible to remove the pins from the connector and re-insert, or do I have to cut the wires and splice them? I am hoping I do not need to splice as I'd like to preserve the clean connection using just the connector if possible. Here is an excerpt from that post that describes the issue: "I purchased a CURT C32FV adapter as well as a Curt brake controller from eTrailer. [describes car not starting, fuses blown, etc....] and then thought I should check the pinouts on the adapter Curt adapter. Guess what? They were all backwards. The 12v + / ground were reversed, and the brake pedal / brake signal to trailer connector were reversed.... no wonder the fuses popped! I cut the adapter wires and reversed them, and now it works perfectly!" I will probably order the Curt controller and adapter harness regardless, but would love to know whether I will need to swap the wires around on the adapter, or not. Thanks for any info you can provide.

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See All (5) Replies to Alex M. ∨

Answer 1

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Answer 2

With your 1994 Coleman Fleetwood Four Seasons Yosemite having 10" wheels and looking to weight 1,850 pounds, from what I could find out, you will have either a 2,000 pound axle, or a 2,200 pound axle. This will mean you either have a spindle…

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Answer 3

Since your hubs have inner and outer bearing numbers L44649 the correct bearing kit you would need is the part #BK1-150. I attached a trailer bearing install video for you to check out as well. For the standard spindle you would use the TruRyde…

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Answer 4

Your 20.5x8.0-10 tire can be swapped to a 205/65-10 without issue at all. I suggest going with the Kenda 205/65-10 Bias Trailer Tire with 10" White Wheel - 4 on 4 - Load Range D #AM3H410 as this will have a load rating D (1,320 pounds and 70…

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Answer 5

The current tire size for what I can see in your attached picture is the 205/65-10 which for that we have the part #AM1HP56.

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Answer 6

We do carry the Kenda 205/65-10 Bias Trailer Tire with 10" White Wheel #AM3H430 which is a load range D version of the #AM3H390 with a load range C. Both tires have the 81mph speed rating but the load range D is capable of supporting 1,320lbs…

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Answer 7

Yes, the Jayco trailers use a very unique wiring on their trailers. There is no adapter available that will go from a 7-Way vehicle side connector to a 6-Way square Jayco connector. You will need to make one using the follow parts: 7-Way trailer…

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Answer 8

The modern day size for a 20.5 x 8 x 10 sized tire is 205/65-10. Based on this information, I recommend The Kenda Loadstar Bias Trailer Tire Item #AM1HP56. It is a top-quality bias tire that is great for all terrains and provides a smooth ride. It…

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Answer 9

Hey Danny, thanks for reaching out! I recommend using the Curt Echo Under-Dash Bluetooth Brake Controller #C27JR which will plug into your 2024 Mazda CX-50 using the Adapter #C32FV as long as your CX-50 has the factory tow package. I really like this…

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Answer 10

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Answer 11

Based on your manual indicating 7" brakes it is probably a 2,000 lb axle. That should be a 4-bolt brake flange on the axle as well. Try checking your axle tag to see if you can verify this. The capacity may be listed, or it can be found with the…

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Answer 12

The 2057 and 1157 bulbs are interchangeable with the difference being the brightness. The 1157 is just slightly brighter than the 2057. For a replacement 1157 we have the #A1157B which would work great and would be your best option.

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Brake Controller Recommendation for a 2023 Mazda CX-50 with OEM 7-Way Harness

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