I am having a problem with interior lighting on my newly acquired 69 300 vert. The rear courtesy lights stay on and the map light has quit. The map light had been working when I open the doors, the rear courtesy lights needed new sockets so I replaced them, all checked out fine until I re-installed the panels. Then the map light quit again ( it has burned out already once in the last week or two while I've been working on the interior). The courtesy lights turned off with the door closing before I finished the connections then afterword they wont turn off. I have already checked both door light switches and they are both working fine. Is this maybe a ground problem?