blows all H/L bulbs (4) when brights turned on. testing shows 12v current on to low beams even when switch is off, has current (12V) on both leads to high beam bulb when switch is turned to bright or flash. I tested/replaced H/L relay, no effect. I tested continuity of dimmer & combi switches & show continuity across high & flash (dimmer) when switch is off. question... is the combi ? or dimmer? bad? dimmer piggybacks combi switch. have not removed either switch due to airbag & acsess difficulty. Dealer Tech says can't be switch. Also, fuses for H/Ls do not blow (15amp) . I hooked meter to battery & watched for volatage spike when switch is activated, H/Ls blew but voltage never changed & was @ 14.6 volts with engine idiling. problem came about suddenly.