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 17th November 2023, 13:46   #1
Johnnyboy65
Newbie
 
Rover75 saloon

Join Date: Aug 2017
Location: Six Mile Bottom
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default battery draining over 3 to4 days

My Rover75 CDTI is fitted with new heavy duty battery and the alternator was replaced iast year. The battery is however going flat over a 3 to 4 day period which suggests that an electrical component is not switching off.


I would be grateful to hear if any other members have had this problem and if so, suggestions as to the identity of the cause.


Thank You.
Johnnyboy65 is offline   Reply With Quote
Old 17th November 2023, 15:05   #2
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,604
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by Johnnyboy65 View Post
The battery is however going flat over a 3 to 4 day period which suggests that an electrical component is not switching off.
It could be that yes, but there's another possibility.

What is your driving pattern at the moment John? Are you doing mainly very short journeys, perhaps not switching off the heated rear window when it's not needed? Even the heaviest duty battery will eventually go flat if it doesn't have enough time to recharge, however good the alternator is.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 17th November 2023, 15:15   #3
macafee2
This is my second home
 
Rover 75 Saloon & Tourer

Join Date: Sep 2012
Location: Lincoln
Posts: 14,997
Thanks: 1,630
Thanked 3,032 Times in 2,181 Posts
Default

Tracing a drain can be difficult but start at the very beginning and prove the battery is ok. Fully charge the battery then disconnect the charger and leave the battery disconnected from the car.
Then test the voltage with a multi meter and then test again after 4 days.

Another test is to fully charge the battery and have someone try to start the car while you test the battery voltage and see what it drops to.

These may not be definitive tests but they are a good indication.

Another test, test the battery voltage of the battery, start the car and test again the battery voltage, it should go up, you may need someone to rev the car while testing.

Are any interior lights being left on such as the one in the boot?

I'm sure others will list "known" problems.

macafee2
macafee2 is online now   Reply With Quote
Old 17th November 2023, 20:10   #4
bl52krz
This is my second home
 
bl52krz's Avatar
 
Rover 75 cdt club + Rover 2.5 KV6 Conni SE

Join Date: May 2008
Location: Birmingham
Posts: 11,440
Thanks: 6,587
Thanked 2,262 Times in 1,729 Posts
Default

As Simon said, leaving the rear window switched on, will take quite a lot of energy from the battery. If you look at the switch for putting the rear window on, you will notice that the warning light on it comes on when the temperature gets down to around 10 degrees automatically. Switch it off.
__________________
Great Barr, Birmingham.
bl52krz is offline   Reply With Quote
Old 17th November 2023, 20:25   #5
Briodyjl01
Gets stuck in
 
Rover 75 Tourer, Rover 75 Saloon

Join Date: May 2018
Location: Castleford
Posts: 982
Thanks: 237
Thanked 185 Times in 113 Posts
Default

Does the car have highline? As if so disconnect the disk drive
__________________
Too many Rovers to count ……
Briodyjl01 is offline   Reply With Quote
Old 18th November 2023, 08:38   #6
Johnnyboy65
Newbie
 
Rover75 saloon

Join Date: Aug 2017
Location: Six Mile Bottom
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Thank you

Many thanks to all who replied to my post with such pragmatic and useful advice, which I will put into practice. Great to have this support from the club.
Johnnyboy65 is offline   Reply With Quote
Old 18th November 2023, 14:12   #7
Johnnyboy65
Newbie
 
Rover75 saloon

Join Date: Aug 2017
Location: Six Mile Bottom
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default thanks

Many thanks for all good advice given. It is very helpful and much appreciated.
Johnnyboy65 is offline   Reply With Quote
Old 19th November 2023, 14:47   #8
xsport
Posted a thing or two
 
rover 75 club se

Join Date: Apr 2011
Location: Leicester
Posts: 1,741
Thanks: 358
Thanked 419 Times in 310 Posts
Default

..... And dont forget the basic things such as battery terminals . Clean the insides of the clamps to posts and make sure they are not loose. Battery to earth connection could also give rise to problems. This can be done 10 mins remove and clean the earth connection and then refit. Nothing to lose here !!
xsport 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 22:13.


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