volt gauge

["G Spencer" <graham_spens@hotmail.com>]

Ok, so while driving my 73 TR6 in hard to work this morning at highway 
speeds I notice the Volt gauge reading 15 close to the red.  While at idle 
its in the middle.  What exactly is this measuring?  Any why the high 
reading while at highway speeds?  I'm guessing it's the output of the Alt, 
is  the high reading bad?

Thanks,
Graham Spencer

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