Brake controller harness for 4th gen Tacoma?

[Snowjunky24]

What wire did you tap into to get the brake light control input?

I’m pondering taking a gooseneck harness adapter to split apart to create a custom harness. Plug it in between the vehicle 7 pin and bumper plug. This will give me pins I can modify to collect left/right turn and the trailer brake wire.

Then use one of the third brake light modules that cancel out the turn signals and are used for toppers.Then run the output from this and a larger gauge wire for the trailer brakes up into the cab under the back driver seat as you have done. I’m also going to order the diode as well.

Any thoughts?

Gr3 goes to r28 in the yellow harness in diagram. You will need a diode so the brake controller doesn’t send voltage to wire.

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[geonerdist]

Yea it seems no one knows yet all the wiring is missing.

I had to run all the wires myself and pay for wiring diagram. I still need to wire a diode as the truck doesn’t like power being applied to brake light circuit without brakes being applied.

Have you wired in the diode yet? All my parts arrived today and I was confused by the diode instructions. I ended up finding this link which answered my question as to how it should be wired up using the CHMSL.
https://www.redarcelectronics.com/u...-faqs/using-an-epdk-in-tow-pro-installations/

 

[geonerdist]

@Snowjunky24 curious to see which wire you actually spliced. I also dug around the wiring diagrams to try to identify which of these was considered light green and couldn’t come up with an answer.

I don’t believe it’s the green one that’s twisted around the red one. I’m leaning toward the one closest to the blue one.

 

[Snowjunky24]

I had to probe it and see what was energized with brake light


Follow pin 11 of r28 connector

 

[MT-Taco]

Did anyone check behind the dash pocket where the factory controller goes? Maybe the harness is there?

 

[Snowjunky24]

Did anyone check behind the dash pocket where the factory controller goes? Maybe the harness is there?

lol yea. A lot more on my base sr5 is missing than that tho

 

[geonerdist]

lol yea. A lot more on my base sr5 is missing than that tho

Same, I tore apart the dash and found nothing. Seems like I have a brake wire from the rear bumper but nothing more on my base TRD OR.

 

[geonerdist]

Thanks for the help everybody. I got my trailer brakes working over the weekend and have had no issues and trailer detection is still working. Pictures before cleaning up wires after the test drive.

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