I have a '94 Sundance with that problem on the rear left side turn / brake / running light. When it apeared 10 years ago the shop used a tie wrap at the socke over the wires to hold tension in a way to put tesion on the assembly to keep a good ground wire connection. That worked for 5 years. Since then I have jammed a round tapered wooden touthpick into the socket in such a way to force the connection closed. Occasionally I must re-adjust the touthpick. I leave the cover off so that I can easily do so. Hey, it is 18 years old! It has been at least a year since I have seen another Sundance / Shadow. I refer to it as the last Sundance.