Vauxhall Mokka Alternator: Specs, Fitment & Common Faults

On the Mokka, removing the auxiliary belt briefly is a genuinely reliable way to confirm whether a whine or grinding noise is really the alternator.

Illustration for editorial purposes

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OEM Part Number: 13588306

Accuracy note: the 1.7 CDTi diesel genuinely shares its alternator with the related Astra J, Insignia A, and Meriva B of the same era.

1.7 CDTi diesel, 140 Amp	Vauxhall OEM: 13588306 (also referenced as 1202318) — shared with Astra J, Insignia A, Meriva B
Petrol variants	Genuinely different alternator reference from the diesel unit, reflecting the petrol engine's different electrical demands and mounting

A Genuine Diagnostic Technique Worth Trying First — Vauxhall Mokka Alternator

If you're hearing a whine or grinding noise that changes with engine speed, it's genuinely worth confirming the alternator is actually the source before paying for a replacement. Removing the auxiliary (serpentine) belt and briefly starting the engine is a well-corroborated diagnostic technique — if the noise disappears with the belt off, it's coming from one of the belt-driven components (alternator, water pump, power steering pump, or tensioner pulley) rather than something internal to the engine. Spinning each pulley by hand afterward, checking for roughness or play, usually reveals which specific component has failed bearings.

Worth knowing when sourcing a replacement: several owners specifically recommend buying new rather than reconditioned when replacing a Vauxhall alternator, citing reported failures of budget reconditioned units within a short time — a locally reconditioned unit from a specialist auto-electrical supplier is often a more reliable middle ground than the cheapest reconditioned option online.

Vauxhall Mokka Alternator: Often Blamed on the Battery Instead

On the Vauxhall Mokka, dim lights, slow starts, a battery that won't hold charge — these symptoms point equally to a weak battery or a failing alternator, and that overlap is why so many replacements target the wrong part first, with the real problem only surfacing weeks later.

Before you buy: alternator output rating varies by engine size and trim, particularly on cars with more onboard electronics. Always confirm against your VIN before ordering.

Vauxhall Mokka Alternator reference plate

Vauxhall Mokka Alternator: What It Does

Electricity generation while the Vauxhall Mokka's engine is running is the alternator's job, charging the battery and directly powering the electrical systems. When it's working properly, the battery mostly just handles engine starting and short demand spikes, not day-to-day electrical load.

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Vauxhall Mokka Alternator: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Alternator Guide for symptoms to watch for (plus a genuinely useful two-minute test to confirm it's not the battery instead), confirming the right amperage and fitment against your VIN, and which brands are worth trusting.

More Vauxhall Alternator

The same part, covered across other Vauxhall models.