Ford EcoSport Alternator: Specs, Fitment & Common Faults

The simple multimeter test that confirms whether it's genuinely the alternator — before paying for a replacement that might not fix anything.

Illustration for editorial purposes

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OEM Part Number: GN1Z-10346-A (genuine alternator — confirm via VIN) — aftermarket alternators Bosch 0 986 084 230 / Valeo 439906

Accuracy note: Covers the Ford EcoSport (2013-) 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 0 986 084 230 (150 A, freewheel pulley, 6 ribs, 54 mm, reman exchange, plug PL174, excludes vacuum pump, £47.03 surcharge); Bosch 0 986 082 220 (120 A, multi-rib rigid pulley, 6 ribs, 49 mm, reman exchange, plug PL174, excludes vacuum pump, £23.51 surcharge); Valeo 439906 (150 A, freewheel pulley, 6 ribs, 55 mm, new, original-equipment pattern); Valeo 440576 (150 A, freewheel pulley, 6 ribs, 55 mm, reman exchange with deposit, £50.24 surcharge); Valeo 440478 (150 A, freewheel pulley, 6 ribs, 54 mm, reman exchange with deposit, £50.24 surcharge); Valeo 440575 (120 A, freewheel pulley, 6 ribs, 55 mm, reman exchange with deposit, £48.42 surcharge); Hella 8EL 015 630-121 (120 A, freewheel pulley, 6 ribs, 54 mm, new); Hella 8EL 011 713-631 (150 A, freewheel pulley, 6 ribs, 49 mm, new)
Outputs & variants	120 A rigid-pulley 49 mm units (Bosch 0 986 082 220, AS-PL A3129, Lucas LRA03009, Ridex 4G0265) are the 1.5 Ti-VCT petrol fitment; 120 A freewheel 54 to 55 mm units (Hella 8EL 015 630-121, Valeo 440575, AS-PL A3259, A3358S) and 150 A freewheel units (Bosch 0 986 084 230, Valeo 439906, 440576 and 440478, Lucas LRA03470, AS-PL A3267S) serve the 1.0 EcoBoost petrol and 1.5 TDCi diesel; 156 to 165 A units (BV PSH 595.515.150.010 and 595.942.165.000, Lucas LRA04425) are the highest-load specification for later Start-Stop and EcoBlue cars.
Genuine (OE) numbers quoted	TG15C186 (AS-PL A3267S, 150 A); TG12C087 (AS-PL A3129, 120 A); TG12C145 (AS-PL A3259, 120 A); TG12C079 (AS-PL A3358S, 120 A).
Fitment notes	The EcoSport shares its alternator range with the Fiesta, B-MAX and Focus of the same era, and the 120 A output comes in both a 49 mm rigid-pulley form and a 54 to 55 mm freewheel form that are not interchangeable, so the old pulley must be checked. Bosch and Ridex references exclude the vacuum pump. Reman Bosch, Valeo and Lucas units carry surcharges from £23.51 to £50.24; the Hella units are marked for fitting by qualified staff.

A Simple Test to Confirm the Alternator Before Replacing It

Before paying for a replacement, it's worth confirming the alternator is genuinely the problem: with the engine running, a multimeter across the battery terminals should read roughly 13.8-14.5V — readings notably below this suggest the alternator isn't charging properly, while readings significantly above 14.5V suggest a failing voltage regulator instead. A whining noise that gets noticeably louder when heavy electrical loads switch on is also a strong practical indicator worth checking first.

Worth knowing when buying a replacement: Several Ford owners report remanufactured or budget aftermarket alternators developing the same whining noise shortly after fitting. A well-reviewed reconditioned unit from a specialist, or a low-mileage genuine used alternator, is frequently a safer bet than the cheapest reman alternative.

Ford EcoSport Alternator: Often Blamed on the Battery Instead

On the Ford EcoSport, a weak battery and a failing alternator produce almost identical symptoms at first — dim lights, slow starts, a car that won't hold charge — which is exactly why so many people replace the battery, only to be back at the garage a few weeks later with the real culprit untouched.

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.

Ford EcoSport Alternator: Watch: Replacing It

🎬 Watch: Ford EcoSport 1.6Ti-VCT Alternator removal replacement

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1.6 petrol

Ford EcoSport Alternator reference plate

Ford EcoSport Alternator: What It Does

The Ford EcoSport's alternator generates electricity while the engine runs, charging the battery and powering the car's electrical systems directly. A healthy alternator means the battery is mostly there for starting the engine and covering brief demand spikes — not for actually running the car's electronics on its own.

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Ford EcoSport 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 Ford Alternator

The same part, covered across other Ford models.