Question is there is a 3 wire plug on the back of the alternator I know what that is but there is a single plug that is labeled as + ... The alt that I removed and had tested has what looks like a big resistor, silver in color about 1/2 inch in diameter and 1 inch long it is mounted with a single screw to the back of the alternator. The remanufactured bosch that I ordered does not have this silver resistor it does have the mounting hole and the terminal marked + Question is what is the silver reistor, what does it do, and does anyone know the part number for it.
thanks
Walt

I believe it is a capacitor to help with interference at the radio. The alternator from my '80 240D that I used to have has one. It is a black rectangle. It is rated at 2.2 microfarads (uF) 100 volts max. The part number on it is: 0 290 800 028 Paul.

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1984 300CD red/blk 290,000 partial resto
1980 240D 4 sp Brn/palomino gone
1997 Mazda Miata STO edition wife's baby
1988 Lincoln Mark VII LSC next resto
1986 Subaru GL wagon daily
1993 Isuzu pickup field beater
2008 Honda Civic EX-L 5sp wife's new car
1978 Honda XL350
1974 Honda XL70 my Calif. ride in HS

Radio noise suppressor. Remove it and install on your new alternator.

Thanks for the info that is what I will do
Walt