One dim parking light?

I went through and worked on all my front end lights today cleaning grounds, etc. to get the headlights, parking lights and marker lights to work.

I was able to get everything to light, but one parking light is very dim. I put a new bulb in it, cleaned the contacts and used some dielectric grease. Both headlights and marker lights are fine; the other parking light is good too, but the passenger parking lamp looks barely lit. Any ideas?