Toyota GT86 Alternator: Specs, Fitment & Common Faults
On the GT86, a genuinely useful, free diagnostic test reveals whether a whine is genuinely a bearing fault, not the alternator.
Illustration for editorial purposes
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OEM Part Number: 23700AA750 (genuine alternator — confirm via VIN) — aftermarket alternators Denso DAN1013 / AS-PL A5298
| Alternators (aftermarket) | Denso DAN1013 (130 A, freewheel clutch pulley, 7 ribs, 58 mm, new OE quality); Denso DAN938 (100 A, freewheel, 7 ribs, 58 mm, new OE quality, supersedes to DAN1317); AS-PL A5298 (130 A, rigid pulley, 6 ribs, 57.3 mm, new Premium Line Mitsubishi-sourced, plug PL_3308, OE A2TX2491); BV PSH 175.515.130.130 (130 A, 6 ribs, 57 mm, new +Line Original); Walker WAL02900 (130 A, rigid multi-rib pulley, 6 ribs, 57 mm, new, plug 0324, £25.12 core charge); Rotovis 9091989 (130 A, rigid V-ribbed pulley, 6 ribs, 57 mm, remanufactured, plug C/S/L); Autoelectro AEG1292 (130 A, rigid multi-rib pulley, 6 ribs, new, round plug B+/C/S/L, £60.28 core charge) |
|---|---|
| Outputs & variants | One output only, 130 A on a rigid 6-rib 57 mm pulley with a Subaru-style C/S/L plug (Mitsubishi A2TX2491), fitted to the 2.0 FA20 boxer in all three power ratings |
| Genuine (OE) numbers quoted | A2TX2491 (AS-PL A5298); DAN1317 (Denso DAN938 replacement) |
| Fitment notes | The GT86 uses a Subaru-sourced Mitsubishi alternator rather than a Toyota Denso, so the correct unit is the 130 A rigid-pulley 6-rib with the C/S/L plug and the 100 A 7-rib freewheel Denso units will not fit; the Walker, Autoelectro and Rotovis exchange units carry £25 to £60 core charges. |
A Genuinely Useful, Free Diagnostic Test Worth Trying — Toyota GT86 Alternator
If you're hearing a whine or grinding noise that might be the alternator, this is genuinely worth trying before condemning the part: with the engine idling, listen to the noise, then progressively add electrical load — headlights, heated rear window, air conditioning. A genuine bearing fault typically gets louder as load increases. It's also worth listening for whether the noise briefly disappears then returns a second or two after decelerating from higher revs — this pattern is a fairly reliable sign of genuine bearing wear.
It's also worth knowing that a breakdown recovery call-out for alternator failure, particularly away from home, can come with a real premium attached.
Toyota GT86 Alternator: Often Blamed on the Battery Instead
On the Toyota GT86, 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.
Toyota GT86 Alternator: Watch: Replacing It
FA20 twins
Toyota GT86 Alternator: What It Does
Electricity generation while the Toyota GT86'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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Toyota GT86 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 Toyota Alternator
The same part, covered across other Toyota models.