I just got done with 2 days of aggravating work on upgrading my headlights with relays. The ground switched system sucks! I think that I figured it out, everything seems ok, but I couldn't find any good articles anywhere or diagrams on how negative switched systems actually work to double check my work. If there is only one negative wire going to each headlight, how is it switching the high and low beams with one wire. My haynes manual only had a diagram for the positive switched trucks.