Battery Warning Light

[gseka]

Sorry if this has been covered before my 05 avensis verso is doing my head in im having problems with the Battery warning light coming on when cold if i rev the engine up or pick up speed over 60 it goes out then when cold its back any advice would be gratefully received.

[acetip]

Sorry if this has been covered before my 05 avensis verso is doing my head in im having problems with the battery warning light coming on when cold if i rev the engine up or pick up speed over 60 it goes out then when cold its back any advice would be gratefully received.

any sign of a squeeking sound after starting up,could be slack/slipping belt that drives alternator

[gseka]

Can't say iv noticed a noise

[acetip]

Can't say iv noticed a noise

thats ok,but check the belt anyway.

[gseka]

ok thanks will do..

[alan333]

Battery warning light signifies a fault in the charging system. A squealing sound when cold would point towards a slack belt. Otherwise your alternator or Battery might be on the way out. If you have a test meter check what voltage you have at the Battery with engine running and battery light on. If the voltage is below about 12 volts the the alternator isn't charging.

:)

[Allyjon]

I believe you should expect 14.2v at the Battery. Could be a faulty diode pack in the alternator