I have my old alternator out and there is a small black plastic electronic part screwed to the back side, about 1" x 3/4" with a wire that plugs into the back of the alternator. It says FACON 2022 2.2uF Max 100 Degrees C 100V =. To move it over to the new alternator, I will have to drill and thread a hole. There is a depression on the new alternator where I can drill, but do I need to do this? What is this part and what does it do?

Thanks much for any advice.

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it is a capacitor

it evens out the voltage highs and lows by storing charge and releasing when appropriate.

if you have a voltage regulator, it may not be necessary- may want to research.

ps.. you may be downgrading to a lower output alt. if there is no place to put that capacitor

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Hmmm. I am replacing a Bosch with a Bosch that I ordered from this website, i.e Fastlane. So it is not a cheapo replacement. I guess I do not have to necessarily screw it to the same location. There are threaded posts sticking out that I can use. That may be a good alternative option.

__________________
85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60