Flat battery car won't start !

[AndyMcc]

Right, I've checked the battery connected to the car with engine off after it was charged for around the last 24hrs. Multi meter showed reading of around 12.5V. Started the car and reading increased to 14.5V, surely this suggests the alternator is doing its job ? have now disconnected the battery and will leave overnight and re test tomorrow morning and see if there's a significant drop in voltage. If there is then surely it's the battery, if there isn't then could a relay or similar be draining it when on the car with engine off ? Would a ObdII reader identify the problem ?Thoughts greatly appreciated.

Andy

[AndyMcc]

For anybody with the same problem it was the battery.

After leaving it disconnected overnight it was putting out 12.3v with the multimeter. Reattached it and tried to start with no turning over, display faults galore on the DIS and the good old clicking noise before it went completely dead. Testing it attached to car with engine off 12.3V and during cranking, the meter dropped to 4.5V ! Tried the meter on another car which read 12.5V with engine off and 11.5v whilst cranking when starting so to me that indicated the battery.

Ordered a Bosch S5 from Euro Parts ( 92.00quid, next day ) and it arrived this morning ( ordered at 11am and it arrived 10am this morning, excellent service IMO ) Fitted and all sorted. Could have got one for 74 but went for the Bosch due to its cranking rate, Ah output and five year guarantee.

Bit hacked off that my original battery went after 3.5 years but hey ho. From what I've read it can happen. It was going into the dealers for this problem so I'll have saved a few quid with their dianostic check and subsequent bill.

Andy