Dustin,
Has your problem been resolved? Is sounds like a bad wire connection right at the connector. To check that, all you need is a multitest meter that checks continuity of a conection. Start with the yellow wire place a straight pin diagonally throught the wire insulation about an inch away from the connector until it has contact with the wire. It’s fine if the pin goes through the wire. Now use the meter to check continuity by placing one leed of the tester to the pin and the other to the coresponding leed on the connector. If continuity is present, wiggle the wire, if no change, that is good. Test remaining wires in the same fashion. If no continuity is found the connector harness should be replaced. there is a quick temperary fix. On the wire with the bad connection. Stick the straight pin through the wiring insulation close to the connector pointing the tip toward where the wire inserts the connector. Insert firmly. Good luck.