I didnīt have any probs with my parking lamps but, I did have a problem with the rear light harness. The bulbs kept working themselves loose and I would lose one light at a time. So I just pulled the contact out a little further from the base of the socket. That gives me enough pressure for the bulb to stay in place. Had no other probs than that. As mentioned, the parking lamps as well as side marker lamps required no attention at all. Hope this makes sense and hope that this is what you are looking for.
1969, X-44, Export Model, Hugger Orange, Std. Int., BC Rear(soon to be a BT 12 bolt), PDB, GMPP 350HO, M22 Supercase, SSM Lift Bars, AirGap, Holley 750, FlowMaster American Thunder Exhaust, FlowTech Headers