My battery kept going flat, I put my multi meter across the terminals and the alternator was charging so thought battery was fooked. Bought a brand new heavy duty battery but it still goes flat! whats going on!!!!!

 

you've got somethin draining it, firstly check your boot lightis swithched off when the boot is closed, and check any add ons or ice is switched off

 

how often does it go flat...might be your alarm if it goes flat after a week or so

 

battery drain
same with my battery mate ,the boot light could be the trouble i will check that in the morning any other ideas,mine goes flat overnight
cheers

 

This is the mad bit tho, car had been stood overnight, come out in the morning and she fired up no probs. I drove 3 miles max to get a new tyre fitted, went to drive out the garage and "click" flat as fook Luckily I had my jump pack in the car and it started straight away

 

Had this on mine and it turned out to be the wiring to the starter, the battery wasnt atchualy going flat

 

Think I've sussed it, had the multi meter on the batterey whilst engine was running, 14.3v which is good, then it shot to 22.4v !, then down to 12.1, then back up to 20 odds!
Turned the car off and tested again and the voltage was steadaly dropping. I recon the voltage regulator on the alternator is blown and overcharged and fried my new batterey
I have a spare alternator and 12 month guarantee on my new battery so it's not too bad!

 

mine was doing the same thing not give charge to the batt should charge at about 14.5v it was only doin 11.3 i just tightened the alt up that sorted it for me