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The alternator charges the battery and powers the electrics while the engine runs. A battery warning light, dimming lights or a battery that keeps going flat can mean it isn't charging.
Enter your reg at the top of the page to see the parts that fit your car. Collect free from any of our 44 branches, usually ready in about 5 minutes while the branch is open, or choose delivery: £4.94, free on orders over £50 (£15 to Scotland, Northern Ireland and the islands).