ignition buzzer comes on ??

[big tom]

hi all
not posted 4 a while.
a buzzer has started to come on / intermittently
scared the hell out of me first time , same as the ignition warning buzz + all the warning lights come on !!
it is intermittent , I think revs related comes on with less revs . on at idle , off with higher revs .
is it the alternator, belts poss a bit loose , need to check them , also ill check the volts output .

wots the 'idle up ' I've read on here ?

so with 800+ revs ish I should be 14.4 volts if its charging proper ?
tom

[big tom]

belts do seem loose
little voltage increase at idle
is it loosen the single bolt under the a/c pump ,then tighten the bolt with full thread , re tighten the other bolt . to adjust the belts ??
no need to loosen the alt. pivoting bolt ?
what deflation in belt am I aiming for ?

[will.b]

Alternator belt

http://wiki.answers.com/Q/How_do_you..._Runner#slide1

[big tom]

belt now tensioned
not charging much better , 13 - 13'5 volts at 1500 revs


as buzzer stops the volt meter on the dash twitch's

really don't want to remove the alt. to take to auto sparks if it is not the fault.

[big tom]

removed alternator , tested at auto spares regulator / rectumfyer blown.
reconed it now works fine .
thanx for help.