battery problems

[daniel-1986]

is my battery coming to the end of its life, as it started first time this morning then was completley flat a couple of hours later, its done it a couple of times lately, i even took it for a motorway blast to put some charge in it last night but still went flat

[gtigolfthree]

You need to get the alternator checked out first to see if its charging the battery properky.

[daniel-1986]

the alternator was new last year, well a recon anyway from gsf

[gtigolfthree]

Unusual for it to start in the morning and then go flat while driving if charging ok.

[Agreeable Slick]

Do a search on here.

Check the regulator in the alternator.

[raferackstraw]

with engine running put a multimeter across the battery terminals set to 20v dc you should see around 14v on meter with no ancillaries running

if your getting 14v battery is fooked 

[daniel-1986]

did that yesterday getting a reading of 14.1v with the engine running, i bought one of them portable jump starters the other day as i didnt want to spend the same money on a new battery only for it to go flat with in a couple of days of buying it

[Agreeable Slick]

As I said check the regulator. It will still charge the battery when the engine is running, but it will not disconnect when the engine is stopped, and thus will keep pulling a charge from the battery until it is empty.

[daniel-1986]

i'll check that next, i also put a multimeter across the the fuses and there was a 12v at the radiator fan, brake lights, radio/cigarette lighter etc and the emergency light (hazards) fuses, shud there be 12v at them plus how do i check if the regulator is at fault

[daniel-1986]

i had a shop do a jump test on my battery and turns out it was knackered so bought another