Did you test it towing trailer with brakes? I know that the wire guages are different sizes on the Z-82 wiring adapter for a very good reason. I also know that they are labeled wrong for a 2006 H2.
I had a Chevy 2500HD with the Z-82 harness installed and attached to my brake controller. The harness that came out of my truck is exactly the same one that Hummer sells. When I removed it out of my truck and plugged it into the H2, it did not work. I had to figure it out myself as Hummer did not yet make one for the 2006 H2.
What I had to do was to remove all of the pins out of the connector, tone out each pin under the H2 dash using my meter, then re-install the pins in the proper places. It now works like it suppose to.
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H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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