To install the Tekonsha P2 Brake Controller # 90885, in your 2004 Hummer H1, you will need to do a little hardwiring, but since you already have a functioning 7-Way trailer connector, there will not be too much work involved to get it installed and ready to tow.
First, you will need enough wire # 10-1-1 to reach from the 7-Way trailer connector at the back of the H1 to the cab of the vehicle where you plan to mount the brake controller. This wire is sold in 1-foot increments. I recommend... view full answer...
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