For what it's worth to someone who may search the archives for a similar problem, the defect was the plug on the back of the passenger side lightbulb. The ground plug had corroded and heated up to the point of failure.

Thanks to all,

__________________
Bob Kopicki
Massillon OH
'97 VW Cabrio (POS)
'93 Miata
'87 300e
'76 GMC C-15
'67 TR-4a