Stalk switch is the usual culprit it may be broken internally. You can messs with it a little by switching it rapidly. Got an extra year out of mine. But replacing is PIA and take some time and patience.
A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models!