Nissan Micra Alternator: Specs, Fitment & Common Faults
On the Micra, a genuine, specific fault: a short factory wiring loom can fray at the voltage regulator plug.
Illustration for editorial purposes
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OEM Part Number: 23100-5FN6A (as quoted in catalogue listings — confirm via VIN) — aftermarket alternators Lucas LRA04404 / AS-PL A3643
| Alternators (aftermarket) | Lucas LRA04404 (90 A, freewheel pulley, 4 ribs, 52 mm, remanufactured, plug 0293, core charge £30.14); AS-PL A3643 (90 A, freewheel pulley, 4 ribs, 52 mm, new, PL_2801 plug, Valeo type); AS-PL A5586S (120 A, freewheel pulley, 4 ribs, 52 mm, new, PL_2801 plug); AS-PL A5490S (120 A, freewheel pulley, 7 ribs, 49 mm, new, PL_2801 plug); AS-PL A5611S (150 A, freewheel pulley, 7 ribs, 49 mm, new, PL_2800 plug); Rotovis 9091762 (120 A, freewheel pulley, 7 ribs, 49 mm, remanufactured, COM plug); Walker WAL01970 (120 A, freewheel pulley, 4 ribs, 52 mm, new, plug 0293, core charge £50.24). |
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| Outputs & variants | Three outputs are listed, all with freewheel pulleys and the Renault-Nissan COM/LIN plug. The 90 A and 120 A units with a 4-rib 52 mm pulley fit the 0.9 IG-T and 1.0 petrol engines; the 120 A and 150 A units with a 7-rib 49 mm pulley fit the 1.5 dCi diesel and the higher-load petrol cars. Rib count is the quickest way to tell the two families apart. |
| Genuine (OE) numbers quoted | 712046 (AS-PL A3643); 23100-5FN6A (Rotovis 9091762); A5TE0181 (AS-PL A5490S); A002TE0081ZE (AS-PL A5611S); F000BL04R5 (AS-PL A01234S); TG15S274 (AS-PL A3851S); A5TE0281ZE (AS-PL A5586S); NRG9S017 (AS-PL A3773S). |
| Fitment notes | Count the ribs on the old pulley and check the output before ordering, because 4-rib and 7-rib units are both sold for this car and will not interchange; Lucas and Walker exchange units carry a core charge refunded on return of the old alternator. |
A Genuine, Specific Root Cause Worth Checking First — Nissan Micra Alternator
A documented, specific fault worth checking before assuming the alternator itself has failed: the factory wiring loom connecting to the alternator's voltage regulator plug is relatively short, and over time the wires can rub through and start to fray at this specific connection point, causing exactly the intermittent charging faults and warning lights that get blamed on the alternator itself.
It's also worth knowing that a genuine alternator fault doesn't always trigger the dashboard warning light — one documented case saw persistent, confirmed alternator symptoms over an extended period with the warning light never illuminating even once.
Nissan Micra Alternator: Often Blamed on the Battery Instead
Because a weak Nissan Micra battery and a dying alternator both cause dim lights, slow starts and charge that won't hold, it's an easy mistake to replace the wrong one first. That mix-up sends plenty of people back to the garage a few weeks later, the real fault still there.
Nissan Micra Alternator: Watch: Replacing It
K13 Micra; no K14 video found
Nissan Micra Alternator: What It Does
Every time the Nissan Micra's engine runs, the alternator is generating the electricity that charges the battery and directly feeds the electrical systems. A properly working alternator leaves the battery mostly responsible for engine starts and short demand spikes — not for running the electronics unaided.
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Nissan Micra 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 Nissan Alternator
The same part, covered across other Nissan models.