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Old 09-06-2013, 04:10 PM   #9
ls1nova71
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Join Date: Dec 2009
Location: Independence Mo
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Re: LS engines with drive by wire cruise control

Just happened to see this thread. Your Rostra switch might work if its anything like Dakota Digital, only the dash mounts will work.. But youve already answred your own question, its your brake lights. The TAC module needs to see a ground through the brake light circuit upon first start up or the cruise won't work. LEDs don't have enough resistance for that to happen. As a test you could replace your brake lights with the factory 1157s, that should fix it. To keep your LEDs you need to load the circuit. You can do this by putting a light bulb in the circuit coming off the switch directly, like you would if you were running a 3rd brake light, tap it into the wire that is hot when the brakes are applied, I'm pretty sure its the white wire. As Daaanz67 said, I have a relay wired into mine and its enough to make it work. Hope this helps. If you have any other questions just ask and I can walk you through it, its actually a pretty simple deal.
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