you are jumping from pillar to post,you must use logic when fault finding,first step,get a volt meter,
check you are getting 12 volts to bulb holder when you dip the head light switch,if you are,then its the bulbs,if you dont then you check the source of supply,are you getting supply to the switch,if not then check the fuse,
it can only be one of these things,
mm
March 2011