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Thank you all for your input. Interesting that the controllers have gotten so complicated. Bama Camper, I also checked continuity, and so did the GMC tech. It went from .08 to 1.7 ohms. It depended on outside temperature. So, it appears that the wire, or more likely the connections are suspect. Looks like the trailer manufacturers had better step up their act on something as critical as brakes!
Will update on what we find.
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Terry and Patsy
Vietnam Veteran, US Navy
2017 3810
2015 GMC Sierra 4X4 3500 SRW
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