1. Check your fuses. One might be bad. 2. Possible bad light switch. Do head lights come on? If they do and no running lights, check fuses and then light switch. Good luck!
old worn sockets do weird things , if you want to find after market sockets and bulbs , solder the connections if you can and see how that works] .Take a look at the wires under the car , there may be something loose .
Sounds like a ground wire issue or the socket not grounding properly. You can try to bend the prongs out a little in the socket to get a tighter fit on the bulb.
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