I haven't put the Suburban controller in the H2 yet (need more miles before towing) I have them in other new GM trucks (should be same system) and it works fine.
I'm running Kelsey controllers.
If I have some time in near future I will put it in and try out one of the trailers.
Did u get factory plug to hook it up?
If they spliced wires they could have done something to brake lite switch.
Did they check the brake lite switch to make sure it is working OK?
If u have factory plug unplug it and see if it is OK then.
When I questioned the Hummer dealer anbout the trailer brakes I got that blank look so I looked under dash myself and pulled the cover off to check it and found it is same as all other GM vehicles.
U might call a GM truck dealer and see what service has to say about the problem (they should have FAR more experience w/ trailers).
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07 White H3 Adventure w/ some black stuff
04.5 GMC D/A CC SLT LB EFI LIVE tuned
98 ZR-2 Blazer
Ex H2&3 owner
My hiking boots and canoe paddle have more miles than most 'offroad' vehicles, over 350 in last year.
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