[LRCXed]

I haven't heard of this one before but it sounds like a cool feature. What I have found in the past though is corroded grounds at the base of the light bulb sockets them selves, and the ground inside the socket it's self can go bad too. If your grounds are dirty, they may only have enough connection while one bulb is lite. Try cleaning everything out to see if it helps you're Priority Lites system. I just finished a GL500I and I didn't see anything out of the ordinary. I would think it would be an addition near the tail lite.



Maybe Dave will chime in soon. He has done many more GL's than most here.