I think there is a fuse that you have to add to the underhood "BEC" ("bussed electrical center").
It is a "J Case" fuse that will get you B+ to your trailer connector at the rear of the vehicle.
See if there is a red "dummy fuse" in the Stud 1 location (location 68). Replace that with an actual fuse.
http://www.autogenius.info/gmc-yukon...e-box-diagram/
I'm going from memory here so I do not recall what size fuse.
K
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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.85 @ 136 mph best
Last edited by Keith Seymore; 11-14-2017 at 06:04 PM.
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