Why does my car click but not start?
What we would buy
- NOCOBoost GB40 1000A jump starter
Compact jump starter for petrol cars and smaller diesels.
NOCO Boost GB40 1000A jump starter: see the price on Amazon → - SimplySM600 600A jump leads, 4 m
Leads, if a second car is usually available.
Simply SM600 600A jump leads, 4 m: see the price on Amazon →
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What the sound means
- Rapid clicking: the starter does not get enough current. Flat battery, or loose or corroded terminals.
- One loud click, then nothing: often the starter motor or its solenoid.
- Nothing at all and no lights: completely flat battery or a disconnected terminal.
- Engine turns slowly but will not catch: weak battery, or a fault elsewhere.
What to do
- Switch off lights, heater and chargers, then try once more.
- Check the battery terminals are tight and not covered in white or green corrosion.
- Jump start with leads and a donor car, or with a jump starter pack. The AA advises members to call it before attempting a jump start.
- Once running, drive for at least 30 minutes, or charge the battery.
- If it is flat again the next day, have the battery and alternator tested.
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Frequently asked questions
Can a jump starter damage my car?
Not when used as the instructions say, with the clamps the right way round. Modern packs have reverse-polarity protection.
My battery is new but the car clicks. Why?
A loose or corroded terminal, a fault draining the battery, or an alternator not charging it. Have the charging system tested.
Is a clicking starter dangerous?
No, but repeated attempts drain the battery further. Stop after a few tries.