The M3cutters - UK BMW M3 Group Forum
 

Go Back   The M3cutters - UK BMW M3 Group Forum > M3 Talk > E46 M3 (2001-2006)



Reply
 
Thread Tools Display Modes
Old 16th October 2009, 08:08 PM   #1
andybimmer
Wearing official underwear
 
andybimmer's Avatar
 
Join Date: Feb 2009
Posts: 186
Car: 2001 bmw m3
Default battery keeps going flat???

hi guys my m3 cab's battery keeps going flat its not the battery as i have had it changed i only use it at the weekend tho do drive it long enough to keep it charged after around the 3days the alarm starts going mad as its getting flat to the point it wont even turn the dash lights on,it must have a drian on something any ideas where it maybe
andybimmer is offline   Reply With Quote
Sponsored links
Old 17th October 2009, 12:12 AM   #2
jaffat200
Achieved official socks
 
jaffat200's Avatar
 
Join Date: Jan 2009
Location: huddersfield
Posts: 594
Car: 2001 bmw m3
Default

any decent electrician will be able to easily track the fault by doin a drop test or u can do it yourself with a multimeter...the most common is an old fone kit still wired in..have a look in the fuse box see if there anywhere where someone has took a feed if so remove it and try...let us know how u get on
jaffat200 is offline   Reply With Quote
Old 17th October 2009, 01:34 AM   #3
rtype220
On the path
 
rtype220's Avatar
 
Join Date: Aug 2009
Posts: 102
Car: 2002 BMW M3 SMG
Default

Your alternators on the blink
rtype220 is offline   Reply With Quote
Old 17th October 2009, 02:18 AM   #4
sheraz2
Wearing official underwear
 
sheraz2's Avatar
 
Join Date: Apr 2009
Posts: 246
Car: 04 Estoril Blue Vert SMG
Default

Sounds like a drain! Mate had it in his 5 series a few years ago, stealers charged him 600 to locate and fix it. It was something simple in the end but they charged him few hours labour.

So be warned!
sheraz2 is offline   Reply With Quote
Old 17th October 2009, 07:51 AM   #5
andybimmer
Wearing official underwear
 
andybimmer's Avatar
 
Join Date: Feb 2009
Posts: 186
Car: 2001 bmw m3
Default

thanks guys im gana have a look today mine has got the phone so mite start there
andybimmer is offline   Reply With Quote
Old 17th October 2009, 08:15 AM   #6
richb
On the path
 
richb's Avatar
 
Join Date: Jul 2009
Location: Worcestershire
Posts: 82
Car: M3 Convertible
Default

Quote:
Originally Posted by sheraz2 View Post
Sounds like a drain! Mate had it in his 5 series a few years ago, stealers charged him 600 to locate and fix it. It was something simple in the end but they charged him few hours labour.

So be warned!


Yes, be warned..... Dont take it to the main stealers.

I had a similar problem also in a 5 series a while back, was a drain and a simple fix when located.
richb is offline   Reply With Quote
Old 17th October 2009, 04:10 PM   #7
suraj
A Chosen One!
 
suraj's Avatar
 
Join Date: Mar 2007
Location: Manchester
Posts: 5,881
Car: Not an M3 ;)
Default

Could also be your battery not being able to hold charge and/or your alternator not charging the battery properly?
suraj is offline   Reply With Quote
Old 17th October 2009, 04:39 PM   #8
naylor04
Wearing official underwear
 
naylor04's Avatar
 
Join Date: Sep 2009
Location: Beds/Herts
Posts: 167
Car: 2001 M3 Convertible , Carbon Black
Default

Do these ///M's have a final stage resistor (hedgehog) ? It could well be that your is on the blink . Its a component that shuts everything down once you have locked your car , it does this in stages and the main problem is that it doesnt shut down your heater fans .So once you've locked your car the heater still runs in the background hence a flat battery the next morning . I had this problem on my 5 series. Just a thought.

Lee.
naylor04 is offline   Reply With Quote
Old 17th October 2009, 06:11 PM   #9
andybimmer
Wearing official underwear
 
andybimmer's Avatar
 
Join Date: Feb 2009
Posts: 186
Car: 2001 bmw m3
Default

not shore going to try unpluging the phone as thats always on charge if its pluged in and only ever use the car at weekends fingers crossed it will be something easy!!!
andybimmer is offline   Reply With Quote
Old 17th October 2009, 07:59 PM   #10
kgturbo
A mere Chipper
 
kgturbo's Avatar
 
Join Date: Sep 2009
Location: west lothian
Posts: 10
Car: 2001 M3 MANUAL TITAN SILVER
Default

Quote:
Originally Posted by naylor04 View Post
Do these ///M's have a final stage resistor (hedgehog) ? It could well be that your is on the blink . Its a component that shuts everything down once you have locked your car , it does this in stages and the main problem is that it doesnt shut down your heater fans .So once you've locked your car the heater still runs in the background hence a flat battery the next morning . I had this problem on my 5 series. Just a thought.

Lee.
the battery on my 5 series was showing the same symptoms and it was traced to the final stage resistor very common fault on the 5's.
kgturbo is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes



All times are GMT +1. The time now is 12:07 AM.


This website uses cookies. By continuing to use the site you are agreeing to our use of cookies. To find out more about the cookies this website uses, click here.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright © 2007 - 2014 M3cutters. All Rights Reserved.