This seems like somewhat of a common problem, but with different variations. My situation is a '99 suburban k1500, DRL's work fine, but if I turn the headlights on I get nothing except parking lights. I don't even get brights. Most people I have seen throughout the forums have at least had brights. Has anybody had luck troubleshooting this yet. I haven't seen one forum where there has been a working solution.....Thanks! I have seen that DRL module thing, but nobody has responded that it worked yet. I really want to avoid taking it to a dealer!