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Insure the drive belt is turning the alternator properly. When it is wet outside the belt will slip quite a bit more if it is not tensioned properly. Also ....the ground from the battery post to the engine block needs to be checked to insure a great connection. Any resistance in the ground cable OR the positive cable from the alternator to the positive post of the battery will cause your issue....dampness will make these issues worse.
Would check output of alternator when damp/wet outside...and find a tech that KNOWS how to perform a voltage drop test on the battery cables and the alternator output wire that goes back to the battery.
IF IT IS ON THE OUTSIDE OF THE OTHER BELTS, ALL YOU HAVE TO DO IS UNBOLT THE TOP OF THE ALTERNATOR, AND PUSH IT IN TO LOOSEN THE BELT FOR REMOVAL! IF IT IS IN BACK OF THE BELTS (ESPECIALLY A SERPENTINE BELT) YOU'LL HAVE TO REMOVE THE SERPENTINE BELT FIRST! THERE WILL BE A TENSION PULLEY HOLDING THE BELT TIGHT! YOU'LL NEED TO USE A WRENCH TO PULL THE TENSION PULLEY TOWARD YOU TO LOOSEN BELT! WATCH HOW YOU REMOVE IT, BCUS YOU'LL NEED TO PUT IT BACK ON THE SAME WAY! THEN REMOVE, AND REPLACE THE ALTERNATOR BELT AS BEFORE, THEN REPLACE THE SERPENTINE BELT!
To adjust the belt tension on a 72 you can slightly loosen the bolts that hold the alternator in place, pull the alternator towards the outside of the loop the belt makes, then re-tighten the alternator bolts. If you can't get enough tension through the adjustment you'll need to replace the belt.
The timing belt is not on the outside of engine. What you are describing might be the belt tensioner. The bolts you speak of in alternator are the mounting bolts. If the "smooth" wheel is vibrating, then replace the wheel. That is the belt tensioner.
loosen tensioners using a pry bar or equivalant and loosen tensioners on ac and alternator then tighten when replaceing. work on outside belt off fist and then inside belt off second. then install inside belt first and then outside belt. you will see a grooved hole where the bolt goes through the alternator to reduce tension.
I had the same problem, repeatedly for more than a year. Turns out that the first time the belt broke and was replaced, something in the piece that the belt raps around was moved very slightly out of line. The mechanic told me that the piece has to eb calibrated perfectly; otherwise the belt will keep loosening and breaking. The piece--I think it was the bracket (or whatever) on the water pumpt that holds the belt onto the pump--was reclaibrated, and, voila! No further problems, at not yet.