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The proper term is "spray and pray", that is, if it works, just paint and ship, rebuilder.
All that design Bosch and re-branded-as-Volvo alternators have weak springs on the alternator regulator so as the brushes wear, they hop and do not charge as much. Lots of places sell the brushes, used to be $2.50 a set, now is about $7.00 a set. A brush regulator assembly is about 5 times or more that price.
Shade tree mechanic cheap repair for financially difficult times: Pull the neg cable on the car, with alternator installed on car, take the reg-brush set loose by the two screws and tip out from inside of alternator, on bench-use an o-ring pick or ice pick to open the stock crimps for the brushes--watch out, the springs still can push the brushes and themselves out and onto the floor--, match the length of the insulation sleeve with the old one yet do not cut the lead. Now slide insulation and spring on the brush and poke through crimp hole, pull on lead so the top of the brush just enters the holder guide and use a diagonal cutter to gently close the opened crimp, then optionally solder but must cut off the excess lead; now clean and shine the contact tabs, take it to the car and tip the assembly into the alternator and install the two screws, then install the negative cable and check the charging output. Unless a bad bearing or diode exists, this is the cheapest way to go.
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