One headlamp not fully opening-

It's probably the headlight gears which disintegrate over time. Check the Corvette Action Center for more information: http://www.corvetteactioncenter.com/tech/knowledgebase/article/1988-1996-corvette-technical-instructions-headlight-motor-gear-replacement-1222.html

I just got this from Corvette Forum. This may help. It also may be stripped or broken teeth. I just got back from getting my headlight repaired by someone recommended by a fellow forum member and I thought I'd update everyone on the actual problem. No it wasn't bushings or gears but another matter not apparent until teardown. There is a part I believe called the pivot bolt that the headlight,well, pivots on and the crosspin thru this bolt had sheared off. We called Chevrolet and were told this was a discontinued part. Upon close examination we determined that the crosspin was a press fit so it was removed. A new cross pin was made from the shank of a suitable size drillbit and it works like a champ. I can imagine what Chevrolet would have charged me for a replacement headlight assembly since they never fix anything. Jim Read more: http://www.corvetteforum.com/forums/c4-general- discussion/3460306-corvette-headlight- problem.html#ixzz3pw6t6gPd