i have the same problem...the passenger side light turns off when headlights are on and brake is pressed... im almost 100% positive this is caused from a bad ground...and my lights are very dim also..i think they are dim just because thats how 6 volt is <img src="http://forums.aaca.org/images/graemlins/frown.gif" alt="" /> so for now i just left it so the passenger light turns off when the headlights are on...i figure people will no when i press the brake better than having 2 super dim where you can barely see the change lights <img src="http://forums.aaca.org/images/graemlins/smirk.gif" alt="" />