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 22nd November 2020, 15:55   #1
steve-45
This is my second home
 
steve-45's Avatar
 
Rover 75 Saloon CDTi

Join Date: Oct 2015
Location: Belvedere
Posts: 4,076
Thanks: 108
Thanked 1,089 Times in 774 Posts
Default Battery Going FLAT

Not used my 2004 Diesel for about a week and when I tried to start it the battery was very nearly flat, the battery is a 9 month old heavy duty Bosch unit.

Charged it up for over 24 hours, not connected to the car, and checked the voltage 48 hours later and it was a stable 12.8 volts.

Connected up to the car, pulling out the FBH plugs, and within 3 days nearly flat again.

Gave it a good 24 hours charge and reconnected it to the car with an ammeter in the circuit.
I found that after about 30 minutes it was still drawing 0.45 amps (450ma). Is this normal is it seems a little high to me?

If so, any ideas where I should start to look for this current drain?
steve-45 is offline   Reply With Quote
Old 22nd November 2020, 16:40   #2
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

Quote:
Originally Posted by steve-45 View Post
I found that after about 30 minutes it was still drawing 0.45 amps (450ma). Is this normal is it seems a little high to me?
Me little black book says after 18-20 minutes, the drain should be in the 30-45mA range, so you've got a parasite somewhere. Anything glowing at night that shouldn't be (LSM?).



TC
T-Cut is offline   Reply With Quote
Old 22nd November 2020, 16:43   #3
steve-45
This is my second home
 
steve-45's Avatar
 
Rover 75 Saloon CDTi

Join Date: Oct 2015
Location: Belvedere
Posts: 4,076
Thanks: 108
Thanked 1,089 Times in 774 Posts
Default

So drawing 10 times what it should be, don't think there is anything glowing away, but I will go out later tonight re-connect the battery and have a look about in the dark.
steve-45 is offline   Reply With Quote
Old 22nd November 2020, 16:44   #4
macafee2
This is my second home
 
Rover 75 Saloon & Tourer

Join Date: Sep 2012
Location: Lincoln
Posts: 14,890
Thanks: 1,630
Thanked 3,032 Times in 2,181 Posts
Default

Are any internal lights staying on (boot glove box), is there a fitted sat nav?
I would be tempted to charge the battery off the car, check voltage, leave for a few days sill off the car then check again.

macafee2
macafee2 is offline   Reply With Quote
Old 22nd November 2020, 16:53   #5
Synchromesh
Gets stuck in
 
Rover 75 Saloon

Join Date: Jan 2010
Location: Preston
Posts: 624
Thanks: 50
Thanked 44 Times in 32 Posts
Default

After everything had shut down I measured my petrol V6 as background 16mA with slightly higher pulses corresponding to the burglar alarm LED.
Synchromesh is offline   Reply With Quote
Old 22nd November 2020, 16:57   #6
Synchromesh
Gets stuck in
 
Rover 75 Saloon

Join Date: Jan 2010
Location: Preston
Posts: 624
Thanks: 50
Thanked 44 Times in 32 Posts
Default

0.45A is about 5W so it could be your glove box light.
Synchromesh is offline   Reply With Quote
Old 22nd November 2020, 17:29   #7
steve-45
This is my second home
 
steve-45's Avatar
 
Rover 75 Saloon CDTi

Join Date: Oct 2015
Location: Belvedere
Posts: 4,076
Thanks: 108
Thanked 1,089 Times in 774 Posts
Default

Thanks for all your suggestions, I will investigate some more after dinner this evening.
steve-45 is offline   Reply With Quote
Old 22nd November 2020, 18:55   #8
steve-45
This is my second home
 
steve-45's Avatar
 
Rover 75 Saloon CDTi

Join Date: Oct 2015
Location: Belvedere
Posts: 4,076
Thanks: 108
Thanked 1,089 Times in 774 Posts
Default

So, reconnected the battery now its nice and dark.

The LSM is not staying illuminated....

The glove box light was off, and switches on and off like it should do...


More investigation needed tomorrow.
steve-45 is offline   Reply With Quote
Old 22nd November 2020, 20:07   #9
macafee2
This is my second home
 
Rover 75 Saloon & Tourer

Join Date: Sep 2012
Location: Lincoln
Posts: 14,890
Thanks: 1,630
Thanked 3,032 Times in 2,181 Posts
Default

is a saloon what about boot light?

macafee2
macafee2 is offline   Reply With Quote
Old 22nd November 2020, 20:14   #10
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

At that sort of discharge something would probably feel warm to the touch.

The info you gave about your battery says your battery is OK.
COLVERT 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 02:06.


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