Recommendation for Installing Trailer Brake Controller in 2008 GMC Sierra SLE Without Tow Package  

Question:

Expert Reply:

In your 2008 GMC Sierra SLE that is not prewired for a trailer brake controller your installation will be hardwired and will require the controller unit itself and part # HM40975. This part is a 7-way that plugs in to the round U.S. car connector located under your bumper. The controller of your choice will wire into existing blunt cut wires located under the dash, as shown in the linked photo. The whole process is clearly outlined in the article that I have linked for you.

Brake controllers come in two types, time-delayed and proportional. Time-delayed units like the Activator # 5504 are preferable in some specific applications but otherwise we always recommend a proportional type unit like the popular and reliable Prodigy P2 # 90885 or the P3 # 90195. These controllers offer the best flexibility with different types of braking systems, include built-in diagnostics and are considered by our customers to be the easiest to set up and use.

Please refer to the linked review videos for more on these two controllers and also to the installation video showing use in your same truck.

expert reply by: Adam R

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