Hyundai Tucson Alternator: Specs, Fitment & Common Faults
A genuinely useful diagnostic benchmark: resting and running voltage figures reveal whether the alternator is genuinely charging correctly — plus a practical safety test for driving with a warning light on.
Illustration for editorial purposes
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OEM Part Number: 37300-2E300 (as quoted in catalogue listings — confirm via VIN) — aftermarket alternators Bosch 0 986 085 610 / AS-PL A3553S
| Alternators (aftermarket) | Bosch 0 986 085 610 (130 A, pulley not stated, remanufactured exchange, core charge £23.10, excludes vacuum pump); AS-PL A3553S (120 A, freewheel pulley, 6 ribs, 58 mm, new, PL_3307 plug); AS-PL A3502S (130 A, freewheel pulley, 6 ribs, 58 mm, new, PL_3307); AS-PL A3574S (150 A, freewheel pulley, 6 ribs, 58 mm, new, PL_3307); AS-PL A3840S (150 A, rigid pulley, 6 ribs, 58 mm, new, PL_3307); AS-PL A9250S (120 A, rigid pulley, 6 ribs, 58 mm, new, PL_3307); BV PSH 155.929.130.500 (130 A, freewheel pulley, 6 ribs, 55 mm, new Valeo-built unit, M8 B+ terminal); Rotovis 9092263 (150 A, freewheel pulley, 6 ribs, 58 mm, remanufactured, C/L/FR plug). |
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| Outputs & variants | Three outputs are listed, 120 A, 130 A and 150 A, all on a 6-rib belt. The 120 A units suit the smaller petrol engines, the 130 A units the mid-range petrol and 1.7 CRDi, and the 150 A units the 2.0 CRDi and higher-spec cars. Pulley diameter splits 55 mm and 58 mm, and both freewheel and rigid versions of the 120 A and 150 A units exist, so the pulley type on the original must be matched. |
| Genuine (OE) numbers quoted | AS-PL A3553S quotes 37300-2E300; AS-PL A3502S quotes 37300-2B960; AS-PL A3574S quotes 37300-2E721; AS-PL A3840S quotes 37300-2E820; AS-PL A9250S quotes 37300-2E400; AS-PL A1055S (150 A, 55 mm freewheel) quotes 8400291; AS-PL A3614S (130 A, 55 mm freewheel) quotes FG15S108. |
| Fitment notes | The site does not tie each unit to an engine code, so match the Hyundai part number on the old alternator (37300-2E300, 2B960, 2E721 or 2E820) before ordering; a freewheel clutch pulley must be replaced with a freewheel pulley, and the Bosch and Lucas-style exchange units carry a refundable core charge (£23.10 Bosch, £50.24 Walker). |
A Genuinely Useful Diagnostic Benchmark Worth Knowing — Hyundai Tucson Alternator
If you're trying to determine whether the alternator is genuinely at fault, this is worth knowing directly: with the engine off, battery voltage should read between roughly 12.4 and 12.7 volts. Once the engine is started, this should rise to between roughly 13.7 and 14.7 volts if the alternator is charging correctly — a reading that stays low or barely rises once running points toward a genuine charging fault rather than simply a weak battery. If a warning light appears while driving and you're unsure whether it's safe to continue to a repair location, a genuinely practical test worth trying: turn off every accessory you safely can — climate control, heated seats, non-essential lights — and see if the warning clears. If it does, this suggests there's still enough charging capacity to get you somewhere safely with reduced load, even if the alternator isn't performing at full capacity.
It's also worth knowing that on some models, the fuse protecting the alternator circuit isn't a conventional, easily replaceable fuse at all, but a shunt in a different physical location from what a generic guide for a related model might show — if you can't locate a traditional alternator fuse where you'd expect one, it's worth checking specifically for a shunt near the battery's positive terminal instead.
Hyundai Tucson Alternator: Often Blamed on the Battery Instead
On the Hyundai Tucson, 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.
Hyundai Tucson Alternator: Watch: Replacing It
2.0/2.4 petrol is the 2016-2020 TL Tucson
Hyundai Tucson Alternator: What It Does
Electricity generation while the Hyundai Tucson'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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Hyundai Tucson 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 Hyundai Alternator
The same part, covered across other Hyundai models.