Right low beam headlight shuts off immediately

I turn the key and both left and right DRL's come on, but the right dip light shuts off immediately, even before car starts. It stays off when I switch from DRL's to Headlights. Bulb works, fuse is good, and all other bulbs in headlight assembly work as they should. If I disconnect the main wire harness to the headlight assembly then start the car and wait a few seconds before reconnecting it, the dip light will stay on. Light functioned properly as I was shutting off the car and restarting it several times. When I tried again two hours later the same problem.