Thanks for your help, I'll go through this step by step and an earth does seem to make sence, espcially as you mention heat from arcing improves connection...this would seem to tally with what is happening.
Thanks for the replies...
Already had 2 different mechanics do the alternator, and tightened the belt. I can also see the alternator pulley and belt while the engine is running and all seems to be fine.
Also, if it was a loose belt - would it not happen randomly, and not just after being stood...
Got a strange long term problem with my electrics...this has been ongoing for about 2 years!
A couple of years ago, first thing on a morning, or after the car (1993 Toyota MR2) had been stood for hours, when I first started, a number of dashboard lights would illuminate and the battery meter...
