99 Dodge....has a meyer plow setup on it and the headlights are run through a changeover module. Worked fine...just noticed one light is 90% dim.....barely working. Replacement bulb does the same. Have cleaned and played with the connections and everythings nice and clean/greased as always. Any ideas? Bad ground? Bad changeover module? I hate electrical problems. Help! I actually saw a truck going down the road the other night with the same symptom and problem...was a Ford.