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Has My Alternator Died?

dan-0

By dan-0,
in General Maintenance

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dan-0 Enthusiast

dan-0

Posted
Posted

Hey guys

I have taken my cluster and dash accessories ouut and have not used the car in a few days. Using a multimeter:

  • My battery is sitting on about 11.92v turned off.
  • I cannot start the car, it just makes a ticking sound under the bonnet.
  • If I connect my car to another car running the battery sits on about 13.8v.
  • It will start properly but when I disconnect the other battery the car dies??

Any ideas?

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https://www.sau.com.au/forums/topic/402448-has-my-alternator-died/
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t_revz Grand Master

t_revz

Posted
Posted

Could be battery or alternator. But Im leaning towards battery. If you can use a charger on your battery and retest. Also try testing voltage not running then turn on headlights and see If it drops right down

t_revz Grand Master

t_revz

Posted
Posted
  On 13/06/2012 at 7:56 AM, jjman said:

wouldnt the easiest way to test this be to turn off the car that your jumping it from?

that way if it keeps running its the battery. If it stops its ur alternator?

He already did this and it died. It should keep running if it's the alternator until the battery is depleted so sounds like a battery to me
89CAL Grand Master

89CAL

Posted
Posted
  On 13/06/2012 at 8:27 AM, t_revz said:

He already did this and it died. It should keep running if it's the alternator until the battery is depleted so sounds like a battery to me

No. From his post he hasn't checked the cranking voltage of the car, only the static voltage

Checking the cranking voltage tells alot of the story.

t_revz Grand Master

t_revz

Posted
Posted

My last post wasn't directed at yours Cal. I agree with your suggestion however a starter that Is clicking can be hard to get a reading as the multimeter usually won't keep up with the varying voltage. Plus if the battery is flat it will read low even though the battery might be fine. But more things Op tests the better:)

89CAL Grand Master

89CAL

Posted
Posted
  On 13/06/2012 at 9:38 AM, t_revz said:

My last post wasn't directed at yours Cal. I agree with your suggestion however a starter that Is clicking can be hard to get a reading as the multimeter usually won't keep up with the varying voltage. Plus if the battery is flat it will read low even though the battery might be fine. But more things Op tests the better:)

Haha wow sorry man. Thought you quoted me for some reason.

No idea what happened there :S

HR32GTS 4DOOR Community Regular

HR32GTS 4DOOR

Posted
Posted
  On 13/06/2012 at 12:50 PM, Tai1or Made said:

Check the terminals for cracks.

+1 when you try and start it do the terminals get really hot.

take the terminals off the battery, you will probably find they are corroded on the inside if so clean them or get new ones.

Moodles2 Grand Master

Moodles2

Posted
Posted

I've flattened my battery so many times (sealed lead acid type) by leaving my lights on while parked, I always keep a charger in my boot. I've found I need at least 12.4V (12.6V ideally) at the battery terminals for the car to start, anything lower and there is no chance of the starter to even turn once. 11.92V there is absolutely no chance, even my motorbike wouldn't start with that much voltage.

t_revz Grand Master

t_revz

Posted
Posted
  On 14/06/2012 at 6:02 AM, Moodles2 said:

I've flattened my battery so many times (sealed lead acid type) by leaving my lights on while parked, I always keep a charger in my boot. I've found I need at least 12.4V (12.6V ideally) at the battery terminals for the car to start, anything lower and there is no chance of the starter to even turn once. 11.92V there is absolutely no chance, even my motorbike wouldn't start with that much voltage.

For the last yr before pulling mine off the road the battery had a dead cell and sat at 10v started every time. About 9v was the absolute limit. However I run 0 gauge battery cables everywhere.

HR32GTS 4DOOR Community Regular

HR32GTS 4DOOR

Posted
Posted

Usually when a battery has been completely flattened a few times, you won't be able to pull as many amps through it even if it has 12 or so volts. my old battery which was rooted wouldn't start the car at 12 volts the new one will start it at 10.

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