Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 19th January 2020, 16:48   #21
MarkS
Gets stuck in
 
Rover 75 Diesel Tourer, called Perseverance

Join Date: Nov 2011
Location: Bournemouth
Posts: 664
Thanks: 189
Thanked 157 Times in 108 Posts
Smile

At an estimate, a half charged 70Amp hour battery (=35Ah) would discharge with a current of 0.09 amp in ~ 390 hours (35/0.09).

As you state your battery is going flat in several days (~48 hours), I would say that your standby current, (while higher than it should be), is NOT responsible for your battery going flat in several days.

Personally I would suspect the wipers wiping when it gets sufficiently damp. It has the necessary current consumption to flatten a battery in the timescale mentioned, leaves absolutely no evidence, unless actually witnessed, and is known to happen. Personally I would remove the wiper fuse overnight, and see what happens.
But I am open to other ideas.
MarkS is offline   Reply With Quote
Old 20th January 2020, 20:14   #22
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

Batteries from new can be duff.

That 0.09 leak is not the problem.

I'm beginning to suspect your battery.------( Or your multi-meter. )---
COLVERT is offline   Reply With Quote
Old 21st January 2020, 06:49   #23
MarkS
Gets stuck in
 
Rover 75 Diesel Tourer, called Perseverance

Join Date: Nov 2011
Location: Bournemouth
Posts: 664
Thanks: 189
Thanked 157 Times in 108 Posts
Default

It could be your ammeter is inaccurate.

Inside the sun visor courtesy light is a 1.2W festoon bulb, that will draw ~0.1A ( which is near enough 0.09A.)
(Or try a 3W interior light bulb at 3W ~0.25A)

To check your ammeter is accurate, measure the current flowing through that bulb.

What meter current range gave you that reading of 0.09A ? Was it 0.2A ? 0.3A ? 2A ? 10A ? 20A ?

It may be the battery that is at fault. I believe that 20 near complete discharges is all it takes to destroy a car battery.
MarkS is offline   Reply With Quote
Old 21st January 2020, 23:03   #24
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

There's an echo in here ---Lol.
COLVERT is offline   Reply With Quote
Old 22nd January 2020, 16:14   #25
Fred Byrne
Avid contributor
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 194
Thanks: 69
Thanked 60 Times in 23 Posts
Default

Something similar happened to me. I turned out to be the the locking mechanism on the petrol cap. I located it by removing fuses one by one. it was cured by diconnecting the battery for ten minutes. It must have the ECM requiring a re-boot.
Fred
Fred Byrne is offline   Reply With Quote
Old 30th January 2020, 18:36   #26
paul lambers
Regular poster
 
rover 75 2.5 saloon

Join Date: Nov 2007
Location: Gelderland
Posts: 55
Thanks: 0
Thanked 1 Time in 1 Post
Default

I tried locating the problem by taking out fuses one by one, but didn´t really find it. So I eventually brought the car to an car electrician. He located the problem as related to the bluetooth, which I never use. In november there was some welding done. During welding they put clamps on the battery but it didn´t protect the bluetooth apparently. He said that the old Nokia bluetooth system is vulnerable and connected partly outside the fuses and therefore cannot be located as the source by taking out fuses.


So I hope he is right,


Thanks for the help and tips
paul lambers is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:17.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd