I disagree. Unless he retrofits his healights for HIDs, the light is just going to be thrown everwhere, blind oncoming traffic, and attract him attention from Police.it sounds like you've already done all the simple fixes "/ so its prolly in your wiring ... if you replaced the CORRECT fuse and you put in GOOD bulbs ... the only thing left is the wiring ... my advice is to invest a little bit and get HID conversion wiring kits off ebay for like $30 8)
Even with a quality kit he's gonna have a shitty beam because the housings for HIDs and the housings for traditional xenon bulbs are different.ddm tuning however has some good hid kits for cheap, if thats the route th OP chooses to go with. but yeah id say wiring as well.check the connectors that go to the headlights, make sure theyre not corroded or anything.