I have similar problem. My 92 B2600 4x4 has headlight trouble. In addition to pulling back on the handle to get high beams, my low beams come on occasionally. Sometime they don't work at all and I drive 100 feet and then boom..low beams on. Other times not. If you have low beams on, don't pull lever for high beams, cuz when you let go, no lights except parking lites. If you push forward to lock high beams on...has never worked since problem started. Really looking for some help on this.