I have had this same problem on my 1985 740. I have on different occasions (mostly in the winter months) found the contacts on the bulb holders either oxidized or not making good contact. Try cleaning the three metal prongs on the bulb holder with emery paper. If this does not cure the problem then you may be experiencing the impending failure of the Failed Light Relay. It is Relay A on my 740. Try the FAQ's at http://www.brickboard.com/FAQ/700-900/ElectricalCircuitsRelays.htm#LightsDontWorkBulbOutRelay
Good Luck
escrivner
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