Battery Killer

icewind · 19th March 2015, 15:57

Hi

We have a Rover 75 V8 Estate. It went to the used to be dealer for some work on the aircon and ever since it came back it has been flattening batteries in a couple of days.

Put an ammeter on it and there seems to be a mystery 2.3Amp drain.

The repair to the aircon did not go well and the "fixers" were full of nonsense, so I also suspect foul play.

Thoughts and ideas would be much appreciated

Heddy · 19th March 2015, 16:00

You may have to put the tester in series with the neg lead, tape up the door light switch and pull fuses one by one. When the current drops you've found the circuit taking the current.

http://www.the75andztclub.co.uk/foru...88&postcount=1

chillyphil · 19th March 2015, 16:02

I think it's gonna be a major problem, suggest you just give the V8 to me

Though seriously, I don't know where to suggest you start, that amp age suggest something quite meaty, I would take the relay's out one at a time, until you find the culprit.

Unless someone else has come across the same problem after air con work?

Phil

2Diesels · 19th March 2015, 16:13

Not saying this is your problem but my V8 flattened it's battery a time or 2 when I first put it on the road & one dark night I had the bonnet open & could hear something odd...................I then noticed the cooling fan just creeping round & deduced a relay had stuck & was causing the fan to run on. Just with you having the aircon fixed it may be that your slow speed fan has started working again & the relay may be sticky.

Just a thought

icewind · 19th March 2015, 16:20

I Put the ammeter on the positive, but I will try the fuse pulling and see if I can find the culprit.
thanks for help so far.

Heddy · 20th March 2015, 12:26

Quote:

Originally Posted by icewind

I Put the ammeter on the positive, but I will try the fuse pulling and see if I can find the culprit.
thanks for help so far.

As in the video, the tester goes in series with the negative lead so as to eliminate the risk of a short circuit, you don't want a loose pos lead rolling around.

3disco · 20th March 2015, 17:30

Satnav closing down ok?

Les4048 · 20th March 2015, 17:44

Quote:

Originally Posted by icewind

Hi

We have a Rover 75 V8 Estate. It went to the used to be dealer for some work on the aircon and ever since it came back it has been flattening batteries in a couple of days.

Put an ammeter on it and there seems to be a mystery 2.3Amp drain.

The repair to the aircon did not go well and the "fixers" were full of nonsense, so I also suspect foul play.

Thoughts and ideas would be much appreciated

Are you on the Twosixties forum?

T16 · 12th April 2015, 00:28

Notwithstanding the current drain issue, all the v8s seem to kill the batteries rather quickly.

I solved my issue with a Bosch 770CCA AGM battery, was sat connected for 6 months and started first time!

ALso make sure the Satnav is powering down, thats the main culprit.

kaiser · 13th April 2015, 15:03

I am surprised that you have found a battery that lasts 6 month in between starts.
I would have sworn that is not possible.
I have a new battery of the recommended size, and my car will not last 10 days, if it does not get started.

How yours can possibly last six months is beyond me.

What is so special about that battery?

19th March 2015, 15:57	#1
icewind Newbie Rover 75 V8 Join Date: Mar 2015 Location: Exeter Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Battery Killer Hi We have a Rover 75 V8 Estate. It went to the used to be dealer for some work on the aircon and ever since it came back it has been flattening batteries in a couple of days. Put an ammeter on it and there seems to be a mystery 2.3Amp drain. The repair to the aircon did not go well and the "fixers" were full of nonsense, so I also suspect foul play. Thoughts and ideas would be much appreciated

19th March 2015, 16:00	#2
Heddy This is my second home None Join Date: Feb 2013 Location: None Posts: 5,556 Thanks: 465 Thanked 1,161 Times in 924 Posts	You may have to put the tester in series with the neg lead, tape up the door light switch and pull fuses one by one. When the current drops you've found the circuit taking the current. http://www.the75andztclub.co.uk/foru...88&postcount=1 Last edited by Heddy; 19th March 2015 at 16:04.. Reason: Links

19th March 2015, 16:02	#3
chillyphil Gets stuck in MGZT-T Join Date: Oct 2014 Location: Paignton Posts: 618 Thanks: 278 Thanked 90 Times in 72 Posts	I think it's gonna be a major problem, suggest you just give the V8 to me Though seriously, I don't know where to suggest you start, that amp age suggest something quite meaty, I would take the relay's out one at a time, until you find the culprit. Unless someone else has come across the same problem after air con work? Phil

19th March 2015, 16:13	#4
2Diesels Trader ZT 260SE, Connoisseur CDT Join Date: Mar 2009 Location: The Ancient Shire Of Bedlington Posts: 12,597 Thanks: 68 Thanked 506 Times in 305 Posts	Not saying this is your problem but my V8 flattened it's battery a time or 2 when I first put it on the road & one dark night I had the bonnet open & could hear something odd...................I then noticed the cooling fan just creeping round & deduced a relay had stuck & was causing the fan to run on. Just with you having the aircon fixed it may be that your slow speed fan has started working again & the relay may be sticky. Just a thought

19th March 2015, 16:20	#5
icewind Newbie Rover 75 V8 Join Date: Mar 2015 Location: Exeter Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	I Put the ammeter on the positive, but I will try the fuse pulling and see if I can find the culprit. thanks for help so far.

20th March 2015, 17:30	#7
3disco 3disco ROVER 75 CONN TOURER CDTI and ZTT V8 SE LPG Join Date: Sep 2008 Location: chardstock.axminster,devon Posts: 1,493 Thanks: 361 Thanked 94 Times in 85 Posts	Satnav closing down ok?

12th April 2015, 00:28	#9
T16 I really should get out more....... ZT CDTi 135, ZT260SE Join Date: Feb 2011 Location: Dundee Posts: 2,877 Thanks: 10 Thanked 331 Times in 213 Posts	Notwithstanding the current drain issue, all the v8s seem to kill the batteries rather quickly. I solved my issue with a Bosch 770CCA AGM battery, was sat connected for 6 months and started first time! ALso make sure the Satnav is powering down, thats the main culprit.

13th April 2015, 15:03	#10
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	I am surprised that you have found a battery that lasts 6 month in between starts. I would have sworn that is not possible. I have a new battery of the recommended size, and my car will not last 10 days, if it does not get started. How yours can possibly last six months is beyond me. What is so special about that battery?