2007 GMC Sierra Classic Brake Controller | etrailer Lowest Price Brake Controller Guarantee. Installation instructions and lifetime expert support on all purchases of 2007 GMC Sierra Classic Brake Controller. Order online at etrailer [PDF] GMT900 Trailer Brake Controller Install - eworldz 1. The install referenced in the photos is for a 2006 vintage Tekonsha Prodigy Brake Controller in a 2008 GMC Sierra Denali built in late August 2007. Your controller, mounts, wiring and pickup may be different – do your research! 2. The factory supplied brake controller pigtail harness is taped to a bigger wire harness under the dash.
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