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Gary, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 685
Experience:  Senior Technician
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What wire on brake switch do I use to activate trailer brake

Customer Question

what wire on brake switch do I use to activate trailer brake controller.Paul
Submitted: 1 month ago.
Category: Australia Car
Expert:  Gary replied 1 month ago.

Hi Paul,

If you are fitting an aftermarket controller, I would find the wire for the brake light circuit with a test lamp, along under the RHF scuff plate.

The brake pedal sensor inputs to the BCM.

I would not touch anywhere there, you risk causing electronic issues.


Customer: replied 1 month ago.
RHF is that right hand side under driver?
Expert:  Gary replied 1 month ago.

Yes, RHF is right hand front.

The brake light wire should be in the loom under the scuff plate.

Scuff plate clips on and off easily.

Hope this helps.

Kind regards


Expert:  Gary replied 1 month ago.

Hi Paul,

How did you go with your installation?

Do you need any further help?

I hope my advice has been of assistance to you.

Kind regards


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