My gang connector was all good. I pulled the headlights and and turn signals, cleaned everything and put dielectric grease on everything. Problem remained. Pulled and cleaned all fuses in the Jeep and under the hood. Traced all the wires to and from the front lights.
Then I found the problem. I unscrewed the two grounds that are in between the ECU and the airbox, sanded the body and sanded the four ring terminals bolted down there, and screwed the bolts back in. Lights and signals now work fine. I decided to run a ground straight from the negative on the battery to these two grounds, just to be sure it remains a good ground.