Battery going flat overnight

blackbar · 27th August 2015, 10:52

Hi all, don't know where to look next, something is pulling about 3 amps with nothing on in the car ie all lights off and only bonnet open. I have pulled all the underbonnet fuses and relays one at a time and it makes no difference to the reading.
Battery was fully charged yesterday, this morning it is down to 10volts.
I have disconnected the alternator and drain is the same.
Any pointers gratefully received.
Barry

Heddy · 27th August 2015, 11:07

Quote:

Originally Posted by blackbar

Hi all, don't know where to look next, something is pulling about 3 amps with nothing on in the car ie all lights off and only bonnet open. I have pulled all the underbonnet fuses and relays one at a time and it makes no difference to the reading.
Battery was fully charged yesterday, this morning it is down to 10volts
Any pointers gratefully received.
Barry

Have the battery itself checked at Halfords (free) There are other fuses to check but not sure if these are overuled by the ones under the bonnet.

Phil-T4 · 27th August 2015, 11:12

You need to pull the fuses from the passenger side fusebox to identify the circuit responsible, then you'll know were to look.

blackbar · 27th August 2015, 12:34

Quote:

Originally Posted by Phil-T4

You need to pull the fuses from the passenger side fusebox to identify the circuit responsible, then you'll know were to look.

While doing this with SWMBO holding the meter on the battery, she managed to hold it on for about 3 minutes at which point the drain dropped to 170Ma,
I then realised that the car had to "shut down" to get a proper reading. Unless I have not disconnected the alternator correctly ( Red wire ) then I guess the battery is discharging itself over night (if thats possible ), a trip to a garage round the corner for a battery check up is next.
tanks all for your suggestions.
I'll let you know what the outcome is
Barry

Rev Jules · 27th August 2015, 12:50

Quote:

Originally Posted by blackbar

Hi all, don't know where to look next, something is pulling about 3 amps with nothing on in the car ie all lights off and only bonnet open. I have pulled all the underbonnet fuses and relays one at a time and it makes no difference to the reading.
Battery was fully charged yesterday, this morning it is down to 10volts.
I have disconnected the alternator and drain is the same.
Any pointers gratefully received.
Barry

Do you have a Highline Sat Nav???

Rev Jules

stevestrat · 27th August 2015, 12:52

When batteries go it tends to be sudden rather than slowly fading away.

blackbar · 27th August 2015, 13:45

Quote:

Originally Posted by Rev Jules

Do you have a Highline Sat Nav???

Rev Jules

Yes Jules first thing I checked for it shutting down
Barry

blackbar · 27th August 2015, 13:49

Quote:

Originally Posted by stevestrat

When batteries go it tends to be sudden rather than slowly fading away.

I think that is what happened, on charge now but only showing voltage of 11.3v whereas 2 days ago was showing 13v , off charge 10.9v and my battery charger keeps cutting out on overload

Barry

SD1too · 27th August 2015, 19:08

Yep, it's your battery isn't it Barry.

Simon

blackbar · 28th August 2015, 08:03

Quote:

Originally Posted by SD1too

Yep, it's your battery isn't it Barry.

Simon

Yep sure was the battery Simon, got a good deal at ECP, Duracell Car Battery (Type 096 Advanced DA74) £59.99 with 5 years warranty.
Pretty pleased with that.
Thanks for all the help folks.

27th August 2015, 10:52	#1
blackbar Regular poster Rover 75 Connoisseur SE Join Date: Apr 2009 Location: Kenilworth Posts: 92 Thanks: 18 Thanked 2 Times in 1 Post	Battery going flat overnight Hi all, don't know where to look next, something is pulling about 3 amps with nothing on in the car ie all lights off and only bonnet open. I have pulled all the underbonnet fuses and relays one at a time and it makes no difference to the reading. Battery was fully charged yesterday, this morning it is down to 10volts. I have disconnected the alternator and drain is the same. Any pointers gratefully received. Barry Last edited by blackbar; 27th August 2015 at 11:07..

27th August 2015, 12:52	#6
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,547 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	When batteries go it tends to be sudden rather than slowly fading away. __________________ Steve T4 Location Map

27th August 2015, 19:08	#9
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,505 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Yep, it's your battery isn't it Barry. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

27th August 2015, 11:12	#3
Phil-T4 I really should get out more....... MG ZT-T, Rover 75 Tourer Join Date: Mar 2011 Location: Olney Posts: 2,969 Thanks: 245 Thanked 1,088 Times in 657 Posts	You need to pull the fuses from the passenger side fusebox to identify the circuit responsible, then you'll know were to look.