Ford Ka+ Alternator: Specs, Fitment & Common Faults

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

Illustration for editorial purposes

OEM Part Number: 7G9N-10300-CC

Accuracy note: genuine reference confirmed shared across B-Max, C-Max, EcoSport, Fiesta, Focus, Ka+, and Mondeo of the relevant era, since Ford uses common alternator families across its European range.

Alternator	Ford OEM: 7G9N-10300-CC (also referenced as AE8T-10300-AA, AV6N-10300-HA)
Higher-spec/automatic variants	A genuinely different, typically higher-amperage alternator applies to versions with more standard electrical equipment — confirm the amp rating on your existing unit before ordering

A Genuine Test Worth Doing Before Replacing the Alternator — Ford Ka+ Alternator

With the engine running, a multimeter across the battery terminals should read roughly 13.8-14.5V — notably lower readings suggest the alternator isn't charging properly, while readings well above 14.5V point to a failing voltage regulator instead. A whining noise that gets 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 or low-mileage genuine used alternator is frequently the safer choice.

Often Blamed on the Battery Instead

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 Ka+ Alternator: What It Does

The 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.

Ford Ka+ 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.

Ford Ka+ Alternator: Specs, Fitment & Common Faults

OEM Part Number: 7G9N-10300-CC

A Genuine Test Worth Doing Before Replacing the Alternator — Ford Ka+ Alternator

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