Volvo: 1988 760 GLE Intermittent Electrical Failure, electrical shutdown, electrical failure

Question
My daughter's 1988 760 GLE experiences total electrical shutdown while driving...no lights, horn, etc.  Usually, the car will restart after a short period.  This has gone from an infrequent problem (once or twice per year) to a point where it has just occurred twice in 24 hours.  Several trips to Volvo "experts" have failed to isolate the problem.  Any suggestions?

Answer
I had this same problem with my 240 for a while before I figured it out.  If it is, in fact, a COMPLETE electrical shutdown, you probably have corroded tips on your battery terminals.  In my case, the corrosion had gotten just bad enough that when I started the car initially and drove it for a while, there was enough of a connection to keep everything active, but when I would hit a bump in a certain way, or turn a certain way, it would jostle the wire just enough to loose that connection, and everything in the car would shut down.  I would replace the lead tips on the battery, and carefully clean the ends of the ground and live wire going to the battery.  Good luck!