Can anyhelp me on this please?

[outrated]

Hi,

My Subaru,when I start the car my voltage meter reads between 10 and 11 or
less sometimes which makes my car weak, but when i go over 3 and half
thousand revs my voltage shoots up to 13 amd running fine

This is a right pain because sometimes my battery goes flat leaving to
bump the car of leads but the battery is fine.

Has anyone else accoured a similar problem?
Thanks

Ceri

 

[mulder]

Could be a weak battery and/or alternator. You say the battery is "fine"
but have you actually had it load-tested?
If you have a voltmeter (not the one in your car, a handheld one such as
a multitester), connect it directly to the battery terminals. With the
car not running and the key off, the battery should read 12.5V. If it
reads less it is either not fully charged or it's NG. When cranking the
engine to start the battery voltage should not drop below about 10V,
again if it does this indicates a weak battery. With the engine running
at idle with no electrical accessories turned on, the voltage should
read approximately 13.5-14.5V. If it's lower, the alternator may not be
charging sufficiently. If it's higher, it's overcharging.
If you aren't able to do these tests yourself, take it to a shop that
can fully evaluate the electrical system.

 

[outrated]

Hi,

Thanks m8 will take it to a local outfit.

Ceri

 

[Edward Hayes]

AutoZone will do a voltage charging test for you free.

 

[mulder]

Don't think he has Autozone in the UK

 

[Hallraker]

Don't think he has Autozone in the UK

Those poor people in the UK. No wonder our ancestors left there (and other
countries.) No Autozones!

Back on topic, that's how my Subaru behaved when the alternator bit the
dust. Bad voltage regulator in my case. Take my advice, if you DIY, *do
not* buy a cheap alternator. You're only asking for more headaches later.

-Matt

 

[Leo Lichtman]

AutoZone will do a voltage charging test for you free.

^^^^^^^^^^^^^^^
Kragen does this also. If you walk in with an alternator, they will
test it right at the counter. They will also roll a test stand out
into the parking lot and test your entire charging system--the only
cost is for any parts you end up buying.