Mitsubishi Mirage Alternator: Specs, Fitment & Common Faults

On the Mirage, a faulty voltage regulator on related models has genuinely been documented literally causing a battery to boil and fail.

Illustration for editorial purposes

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OEM Part Number: MD317862

Genuinely important to know: current-generation Mirage owners have directly documented Mitsubishi changing the amp rating on this exact part number sequence mid-production without a corresponding name change — and a genuine market split exists, with UK-spec cars using a different reference from US-spec cars for the same model year.

1998-2002, 1.8L, 90 Amp (shared with Lancer 2.0L)	Mitsubishi OEM: MD317862 (also referenced as MD322925, MD375853)
Current generation, 2014-2015 & 2017-2021, US-spec, 85 Amp	Mitsubishi OEM: 1800A360 (supersedes 1800A316)
Current generation, UK/Europe-spec (incl. Space Star)	Mitsubishi OEM: 1800A359 (95 Amp) — genuinely different from the US-spec reference

Mitsubishi Mirage Alternator: Often Blamed on the Battery Instead

On the Mitsubishi Mirage, it's genuinely hard to tell a weak battery from a failing alternator just from symptoms — both produce dim lights, slow starts, and a battery that won't hold charge. That's exactly why so many people end up replacing the wrong part, then returning to the garage a few 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.

Mitsubishi Mirage Alternator: What It Does

Running the Mitsubishi Mirage's electrical systems and keeping the battery charged while the engine turns over — that's the alternator's role. A properly functioning one means the battery only really needs to worry about starting the car and absorbing occasional spikes in demand.

Mitsubishi Mirage Alternator reference plate

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A Genuinely Specific, Real Technical Finding Worth Knowing About Overcharging — Mitsubishi Mirage Alternator

Most alternator faults get discussed in terms of undercharging, but this is genuinely worth knowing about the opposite problem: a faulty voltage regulator within the alternator can actually overcharge the battery, documented on related models literally causing the battery to boil and fail, and potentially damaging engine electronics.

A genuinely useful diagnostic principle worth knowing: if facing multiple, seemingly unrelated electrical symptoms, it's worth checking both the engine bay ground cable and the interior ground cable, often found under the carpet or in the footwells, rather than assuming the fault must be with the alternator or battery themselves.

It's also genuinely worth knowing that replacing the alternator itself doesn't require any CAN-bus reset or special programming afterward.

Mitsubishi Mirage 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 Mitsubishi Alternator

The same part, covered across other Mitsubishi models.