My car won't start without a jump. I’d jump it with cables, it will start with no problem, but as soon as I turn it off, I won't turn over.

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    Have you had the vehicle battery tested? Is the battery in need of a charge - have headlights been left on? Is it charging? Are any warning lights on on the dash when the engine is running - battery indicator for example? – Solar Mike Aug 24 '18 at 5:18
  • How long did you drive after jump-starting? If you drove for half an hour or more, the battery should have charged enough to enable starting. – Hobbes Aug 24 '18 at 7:22
  • And how old is the battery? If it's still the original one, it's probably time to replace it. – Hobbes Aug 24 '18 at 10:36

Had a Rav4 do same thing. I thought it was alternator. Took ground post off while running turned headlights on at same time but it keep running, so not alternator. advance said no not bad battery, but I put a new one in no more trouble. Hope it helps.

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    Welcome to Motor Vehicle Maintenance & Repair. For future diagnostics, on cars from the last 30 or so years, taking the leads off the battery while the engine is running can be detrimental to the charging system. The procedure you describe worked when engines had generators. You can do serious damage. – Pᴀᴜʟsᴛᴇʀ2 Aug 24 '18 at 10:03

That sounds like an empty battery. Now the question is, is the battery just empty or is it in need of replacement.

After jumpstarting, you should drive the car for about half an hour-45 min. That's enough to charge the battery. Then stop the engine and try to start again. If the engine starts, chances are the battery is still usable. If it doesn't, it's time to replace the battery.

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