BMW N54 180A Alternator (180 Amp Generator) - Genuine OEM OE 12317558220 - Replacement/Upgrade for 135i 1M 335i 335xi 335is 535i 535xi - E82 E88 E90 E91 E92 E93 E60 E61 12V Charging Alternator

Original Equipment 180 Amp Charging Alternator for BMW N54 - Part Number 12317558220

Sort your charging issues the right way with this OE 180A alternator for BMW’s twin turbo N54 engine, part number 12317558220. This factory-spec unit restores stable voltage and reliable power delivery to your 12V electrical system, ideal for cars running performance upgrades, aftermarket audio or simply needing a dependable replacement. At MJ Modifications we fit and run genuine parts on our own builds and customer cars, and this unit has proven quiet, consistent and long-lasting.

If you are seeing a battery warning icon, intermittent charging faults, headlight flicker, dim interior lights, slow cranking or random electrical gremlins, replacing the worn generator with this OE-spec 180 amp unit is the proven solution. It is a direct bolt-on with correct plug connections and pulley alignment for E-series N54 platforms.

Why choose this OE 180A unit

• Original Equipment quality - built to BMW specification for the N54 engine family
• 180 amp output - the correct capacity for high-demand E-series electrical systems
• Direct replacement - plug-and-play connectors, proper bracket fit and belt tracking
• Stable voltage - supports factory accessories and typical performance modifications
• Proven on our own cars and customer vehicles - smooth charging and dependable operation
• Ideal fix for battery light on dash, low voltage messages and weak charging under load

Vehicle applications - E-series N54

Fits N54-powered models in the following chassis and trims:

• 1 Series E82 Coupe - 135i, 1M
• 1 Series E88 Convertible - 135i
• 3 Series E90 Saloon - 335i, 335xi including LCI
• 3 Series E91 Touring - 335i, 335xi including LCI
• 3 Series E92 Coupe - 335i, 335xi, 335is
• 3 Series E93 Convertible - 335i, 335is
• 5 Series E60 Saloon - 535i, 535xi
• 5 Series E61 Touring - 535xi

Part number

BMW OE reference: 12317558220

Compatibility check

Add your UK registration or the last 7 of your VIN at checkout and we will confirm you are ordering the correct charging alternator for your exact N54 vehicle before dispatch.

Professional installation

Prefer expert fitting by N54 specialists? Book installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Warranty

Supplied with manufacturer-backed warranty on compatible vehicles when VIN is provided. Contact us for details.

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