On my 1973 Beetle I have these replacement 3 bulb tail lights like this:
The stop light was not working on the left side.
I removed it and replaced it with the same bulb. Then it worked.
After driving the Beetle, I checked it again last night.
The same problem happened again. It worked OK after removing and replacing the bulb.
I think that when I drive and hit a bump the light bulb moves a bit and no longer makes contact.
I was thinking of putting a small piece of electrical tape on the side of the bulb to act as a shim and help keep the bulb from coming loose.
Any other ideas will be appreciated. Thanks in advance!