Powdrhound.... I have an 86 sunrader that I am in the process of trying to figure out which way to go regarding the o/d bypass...I live in Taos, NM at 7500 ft so O/d is needed even just on the many flat, straight roads here. But everything you described is what happened to me as well when I recently transported my new lil rv here....lots of clicking from the relay switch and then since then no o/d. The mechanic is wondering exactly what you asked....where is the relay and what/where picks up the elevation change? Can you tell me more about what you did or how to exactly bypass? Thanks so much....