So over the weekend I decided to black out my headlights, more graphite out my headlights. Pictures coming soon. Anyways, I put everything back together, installed and tested everything. Everything worked instead of a small bulb in the lower corner, not that important. Yesterday while parking I noticed a headlight was out. The main HID bulb, the turn single works. High beams work but the main light doesn't. While driving I think I saw it flicker once or twice so I'm thinking just a loose connection. Can anyone provide any tests or suggestions I should know about before I remove the wheel and so forth. I have little free time over the week to figure it out so I want to be prepared.

Thanks in advance for any information.