I own a 2001 Volkswagen Beetle 1.8T, and sometimes while riding at night the lights will dim and then go back to normal. Has anyone else had this happen and do I need to be concerned with it? Thanks...

Maybe it's because your running A/C and the compressor just kicked in? If so, that's normal.

dont worry, if you listen that is your fans are kickin on to cool of engine. A/c also will do that. no problem :)

Check your battery, you problably need a new battery.