sudden electrical failure

[Brian <bsmith@domain.elided>]

While on a weekend cruise in my 82 Spider, the electrics shut down and the 
car stopped.  No gauges, no starter...nothing.   After sitting for the time 
it took me to open the bonnet and stare pathetically at the motor, the 
electrics came on and the car started and ran for about 30 seconds before 
shutting down again.  Battery connections were good, opening the fuse box 
and wiggling things around a bit resulted in a resurrection of the 
electrical power but it worries me.
Any thoughts as to where the weak link in the electrics could be ? I'm 
guessing a bad ground but before I tear into the fuse area, I'm asking for 
ideas.
Thanks
Brian
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