Brake Controller Trigger Wire?

[cdsvt]

I've read tons of threads here and the violet/orange wire in the trailer controller bundle under the second row passenger seat seems to have been unreliable. Is anything better with the most recent software updates?

Fwiw, I took delivery in July 2025 with the latest software updates.

I'm working on installing a Redarc TowPro Elite (which I've done on several other vehicles- all Toyotas), and found a super useful thread for all wires except the brake signal (Redarc blue) wire.

Redarc wire color - purpose - Vehicle wire color
black - 12v constant - yellow/red
white - ground - black
blue - control - grey
red - signal - violet/orange

Any up to date guidance would be greatly appreciated!

Thanks.

 

[TheDocAUS]

You will need some US input, because I believe the REDARC is wired slightly different in the US to Australia.

 

[Itsdchz]

This is the thread I used to install mine

Thread 'NA Trailer Brake Controller Install'

Mar 16, 2024

Just finished installing and testing a trailer brake controller on our NA Grenadier.

Went with the Redarc EBRH-ACCV3-NA Tow-Pro Elite Electric Brake Controller; as suggested by Mark @ Redarc. This is the same unit we had on our Defender.

I also needed to order a longer remote wire to move the remote head to the front dash area for mounting. The extension hasn’t arrived yet, so for now the remote is strung to sit between the drivers seat and the center console: RHWK-004 13ft Tow-Pro Elite Remote Head Wiring Kit.

On to the wiring…..

1. Under the back seat, on...

• ScottnAZ
• brake controller brake wiring install towing trailer trailer brakes wiring
• Replies: 239
• Forum: Wheels, Tires, Brakes, TC, TPMS, Towing

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[TheDocAUS]

Thanks I added that link over in the Resource section.

 

[cdsvt]

I used that link but the trigger wire isn't ideal. It is an option, but if Ineos fixed the software driving the factory brake trigger wire that would be a cleaner solution.

 

[Itsdchz]

I used that link but the trigger wire isn't ideal. It is an option, but if Ineos fixed the software driving the factory brake trigger wire that would be a cleaner solution.

Only relevant IF they fix. Could be either a software or hardware issue. Hard to tell….. The running of a line to the actual wire, and using the diode, is the best bet for now. Betting on waiting isn’t worth it IMHO.