i too have an 86 that had a bad s/g. it spun, but put out nothing as far as charging. i opted to take it apart and clean the armature, and all points of contact. it was very rusty in there from sitting out in the elements. take your time if this is the route you choose. a fine wire brush, perhaps the kind you'd use in cleaning the nozzle of a spray gun, electrical contact cleaner, an air hose, and a good set of eyeballs. make sure the "a" and "f" terminals are not broke.
this took me about 2hrs. to clean and reassemble. you may need an extra pair of hands. the s/g has been performing flawlessly since then. also make sure your belt is tight enough, any slippage will prevent a low or false reading on the meter. this is what i did on mine. there may be some things i overlooked. i'm sure others will respond. good luck. keep us posted.
rick
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