Before adding a new jack, look close at the beige connections. Could be a whisker. The center wire could be cut short. You can usually see a bad termination.
Also, try using a wrench to snug the connectors. Just a touch.
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Mark S.
2014 Cougar 318SAB
2015 Silverado 3500HD 6.6L Diesel 4WD CC SB
18K Pullright Hitch
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