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Alternator

The alternator keeps the battery in a constant state of charge anytime the engine is running. If your lights are dimming or you hear excessive bearing noise around the alternator, chances are that it's time for a replacement.

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Hitachi Voltage Regulator - BMW E31 E32 E34 E36

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T#:48850064

Part#: 12311747920

Ships in 7 Business Days

$ 37.99 USD

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$ 37.99 USD

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This voltage regulator is a crucial component that controls the alternator's output, preventing overcharging by adjusting the current to maintain a safe range of vehicle voltage, thereby protecting the battery and electrical system. Symptoms of failure include dim lights, battery warnings, or a dead battery, often requiring replacement, which can be internal or external to the alternator.

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Voltage Regulator

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T#:596879

Part#: 12321350052

Back Ordered

$ 41.99

This product was last offered at the strikethrough price on
05-07-2026

$ 39.71 USD

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$ 39.71 USD

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If you are having issues with voltage peaking, lights fading in and out as your driving, or your battery keeps dying despite the car running, It could be the result of a faulty voltage regulator. Voltage regulators control the amount of power coming from the alternator.

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MINI Alternator - SEG Automotive 0125.711.078

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T#:54851993

Part#: 12317613445

In Stock

$ 564.99

This product was last offered at the strikethrough price on
07-16-2026

$ 563.99 USD

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$ 563.99 USD

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SEG Automotive Alternator - SEG Automotive 0121.715.118 - 12317560985...

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T#:54851991

Part#: 12317560985

Ships in 1 Business Day

$ 1,049.99

This product was last offered at the strikethrough price on
07-16-2026

$ 961.99 USD

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$ 961.99 USD

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Hitachi Voltage Regulator - 12317550469 - E88 128i

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T#:48815477

Part#: 12317550469

Ships in 7 Business Days

$ 79.99 USD

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$ 79.99 USD

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Supplies power to your car's electronics and recharges the battery.

SEG Automotive Starter - SEG Automotive 0001.108.460 - 12417610344 - ...

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T#:55857741

Part#: 12417610344

Ships in 1 Business Day

$ 368.99

This product was last offered at the strikethrough price on
07-16-2026

$ 340.99 USD

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$ 340.99 USD

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MINI Alternator - SEG Automotive 0124.325.157

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T#:54851988

Part#: 12317550319

Ships in 1 Business Day

$ 473.99

This product was last offered at the strikethrough price on
07-16-2026

$ 436.99 USD

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$ 436.99 USD

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SEG Automotive Alternator - SEG Automotive 0124.515.223 - 12317519618...

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T#:54851980

Part#: 12317519618

Ships in 1 Business Day

$ 503.99

This product was last offered at the strikethrough price on
07-16-2026

$ 462.99 USD

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$ 462.99 USD

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SEG Automotive Alternator - SEG Automotive 0124.525.588 - 12317541694...

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T#:54851984

Part#: 12317541694

Ships in 1 Business Day

$ 521.99

This product was last offered at the strikethrough price on
07-16-2026

$ 474.99 USD

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$ 474.99 USD

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SEG Automotive New 120A Alternator - 0124.515.052 - E46, E39 525i 530...

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T#:58965210

Part#: 0124.515.052

Ships on Nov 23, 2026

$ 485.99 USD

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$ 485.99 USD

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A strong charging system keeps everything from your ignition to your stereo working at its best, and a failing alternator can undermine all of it.

SEG Automotive New Alternator - 0124.525.523 - E46 325i 325Ci 330Ci, ...

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T#:58965213

Part#: 0124.525.523

Ships on Nov 23, 2026

$ 495.99 USD

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$ 495.99 USD

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Your BMW's charging system powers everything from ignition to infotainment, so a weak alternator affects the whole car.

SEG Automotive Alternator - 12311711204 - E24 635CSi

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T#:59001785

Part#: 12311711204

Ships on Nov 23, 2026

$ 726.99 USD

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$ 726.99 USD

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The E24 M635CSi is one of BMW's great grand tourers, and keeping one healthy means a charging system you can count on.

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