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Here's a brand new alternator from topcn-autoparts for several BMW models: 135i, 335i, and 535i xDrive with the 3.0L engine from 2008 to 2010.

It puts out 180 amps at 12 volts, with clockwise rotation.
It includes a pulley (SC7 class) and has an internal fan and regulator.
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Part number TA11877201P replaces a bunch of OE numbers like 12-31-7-558-219, 12-31-7-558-220, and 0121715016.

It's a direct fit, made from metal with the same finish as OE.
No core charge, no core required.
If your BMW's charging system is failing, this alternator will get you back on the road.

Weighs about 15.5 lbs, and it's backed by good after-sales support.

4 out of 5