I have a 92 300CE with a dead 80A alternator. Can I replace it with a 90A. Can get on for a rebuilt for $20 on this site vs $170 new rebuilt

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Moohampshire
1988 300E 124K
1994 Volvo 850 Turbo 115K Killed by a Cement Truck
1992 300 CE 95 K
1986 300 SL Euro 96K

As long as it mounts the same (pully can be swaped if it's different from yours) and if it provides the minimun amperage output required for your car, then you should be good to go. A little more amperage would be fine, but less would not be good.

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Don't Chrome them; polish them