Renault Megane Alternator: Specs, Fitment & Common Faults

A genuine, documented fault confirms the alternator pulley can literally split — plus a real consumer grievance: diesel models got a recall for a similar issue, petrol models explicitly did not.

Illustration for editorial purposes

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OEM Part Number: 7711368103 (genuine alternator — confirm via VIN) — aftermarket alternators Bosch 0 986 084 690 / Valeo 440679

Accuracy note: Covers the Renault Megane (Mk4 2016-) as listed in the UK aftermarket catalogues. Alternators are sold by output (amps), pulley type and plug, and the same model usually has two or three units depending on engine, start-stop and the electrical load of the trim — a 120 A unit on a car built for 150 A will undercharge, and a rigid pulley on a car designed for a freewheel clutch pulley will shred belts. The references below are UK aftermarket catalogue listings for this generation, labelled by brand; many are remanufactured exchange units that carry a core charge until the old alternator is returned. Genuine numbers are shown only where a listing quotes one. Check the amp rating, pulley and plug stamped on the old unit, or confirm via VIN, before ordering.

Alternators (aftermarket)	Bosch 0 986 084 690 (150 A, freewheel pulley, 7 ribs, 50.3 mm, remanufactured exchange, plug PL382 / B+ LIN, without vacuum pump, £24.86 core); Bosch 0 986 080 410 (150 A, freewheel pulley, 6 ribs, 55 mm, remanufactured exchange, plug PL124 / COM, without vacuum pump, £94.06 core); Bosch 0 986 049 030 (120 A, freewheel pulley, 6 ribs, 55 mm, remanufactured exchange, plug 124, without vacuum pump, £50.24 core); Valeo 440679 (120 A, freewheel pulley, 7 ribs, remanufactured exchange, four-point mounting, £50.24 core); AS-PL A3552S (150 A, freewheel pulley, 6 ribs, 55 mm, new, plug PL_2800); AS-PL A0763S (120 A, freewheel pulley, 6 ribs, 54 mm, new, plug PL_2800); Ridex 4G1176 (150 A, freewheel pulley, 6 ribs, 56 mm, new, B+/COM-BSS, without vacuum pump)
Outputs & variants	120/125 A (49 mm 7-rib or 54-55 mm 6-rib), 150 A (49-50 mm 7-rib or 55-60 mm 6-rib), 185 A (49 mm 7-rib) and 210 A (55 mm 6-rib). Every unit uses a freewheel clutch pulley.
Genuine (OE) numbers quoted	AS-PL A0763S for 0124425037; AS-PL A3552S for FG15T056; AS-PL A3563S for TG12C164; AS-PL A5332 for A3TX0481
Fitment notes	The 7-rib 50 mm Bosch 084 690 and the 6-rib 55 mm Bosch 080 410 are both 150 A but fit different belt layouts, so match the old pulley before ordering. Bosch and Ridex units ship without the vacuum pump. Exchange cores range from £24.86 to £94.06 and are refunded when the old unit is returned.

A Genuine, Documented Fault: The Pulley Can Literally Split — Renault Megane Alternator

A genuine technical bulletin from Autoelectro (a major alternator remanufacturer) confirms a specific, documented fault affecting Clio models — a tensioning issue in the drive belt system that can cause the alternator pulley itself to physically split, triggering the alternator warning light and producing excessive noise from the drive belt area. This is worth knowing as a genuine, confirmed mechanical failure mode rather than simple wear, and it's worth mentioning specifically if you're chasing a noise or warning light in this area, since it points toward a specific component rather than general alternator wear.

A genuinely real, documented consumer grievance worth knowing about: Renault issued a recall covering diesel models (predominantly Scenics) for an alternator-related issue, but explicitly did not extend this recall to equivalent petrol models experiencing what owners describe as a very similar problem — a genuine inconsistency that led some affected owners to raise the issue with the BBC's Watchdog consumer programme. If you're experiencing a documented alternator fault pattern on a petrol model and have been told it isn't covered because "there's no recall," it's worth knowing this specific inconsistency exists and has been a genuine point of frustration for other owners.

A genuinely useful diagnostic technique worth trying: with the auxiliary belt removed, spin the alternator and any other free pulleys by hand — genuine roughness or grinding indicates worn bearings specifically. It's also worth knowing that alternator bearings can seem fine when spun freely by hand but still be noisy once the sideways pressure from the drive belt is reapplied, so a clean spin test alone doesn't always rule out a bearing issue.

Renault Megane Alternator: Often Blamed on the Battery Instead

On the Renault Megane, 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.

Renault Megane Alternator: Watch: Replacing It

🎬 Watch: How to Replace the alternator on the Renault Megane 2008 to 2014 (older gen)

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Mk3 Megane; no Mk4 video found

Renault Megane Alternator reference plate

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.

Renault Megane Alternator: What It Does

Electricity generation while the Renault Megane'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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Renault Megane 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 Renault Alternator

The same part, covered across other Renault models.