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Brake Controller Install Harness Recommendation for 2018 GMC Sierra 1500


Trouble finding 4 port harness plug under dash in new sierra 2018 1500 pickup. Is it in lower junction box or under dash somewhere? Thanks if you can help.


Expert Reply:

The brake controller install harness part # 3016 is the correct harness for your 2018 GMC Sierra 1500 for installing the P3 part # 90195. I attached a picture that shows the junction box and port where it needs to install as well.

I attached an install video for this harness on a similar Silverado.

click to enlarge
expert reply by:
Jameson C

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