Passenger side park light

1980 Chevy Camaro 130,000 miles 350 v8. Park light along with fender light will not work only on passenger side. I've replaced the bulb socket, replaced the bulb, nothing. The headlight, turn signal, 4 ways work ok. Turn signal and 4 ways are dimmer on the passenger side. This is up front the back works fine. I recently replaced the altenator and afterwards for a few minutes the park light did work and was not dim at all. Then it went back out. Thanks in advance for any help.