Rennlist Discussion Forums   classifieds | membership | rennlist | photo album    
sponsors | upload photo | chat    
 
Go Back   Rennlist Discussion Forums > Air/Oil Cooled Technical Discussion Areas > 964 Forum
Sign in using an external account
Register Forgot Password?
Search


Reply
 
Thread Tools Search this Thread
Old 04-29-2003, 09:10 AM   #1
rhunt
User
 
rhunt's Avatar
 
Join Date: Feb 2003
Location: Baltimore, Maryland
Posts: 73
Post Battery goes dead after sitting for a few days

Everytime I let my car sit for a few days the battery goes dead. I replaced the battery and had the alternator checked. I just got my NSX back and have been driving it for a few days, went outside this morning to start the C4 and it was dead again. I had a 1988 928S4 that did the same thing. Is this normal for the C4's? If not what are the common things to check? It is a 1990. Thanks

Rob Hunt <img border="0" title="" alt="[Frown]" src="frown.gif" />
To remove this ad, register today or login if you already are registered!

rhunt is offline   Reply With Quote
Old 04-29-2003, 09:23 AM   #2
Bill Gregory
Super Moderator

Technical Specialist
Rennlist
Lifetime Member
 
Bill Gregory's Avatar
 
Join Date: May 2001
Location: CT
Posts: 5,845
Post

You may want to read an article on 964 battery drain on tech.rennlist.com <a href="http://tech.rennlist.com/911/pdf/add/964batterydrainadrian.PDF" target="_blank">here.</a>
__________________
1993 C2
Bill Gregory is offline   Reply With Quote
Old 04-29-2003, 09:44 AM   #3
rhunt
User
 
rhunt's Avatar
 
Join Date: Feb 2003
Location: Baltimore, Maryland
Posts: 73
Post

Sounds like it is a normal thing. I guess I am lazy when it comes to starting the car when not driving it. Thanks.

Rob
rhunt is offline   Reply With Quote
Old 04-29-2003, 10:45 AM   #4
Andy Roe
Addict
Rennlist Member

 
Andy Roe's Avatar
 
Join Date: May 2002
Location: Bologna, Italy
Posts: 3,313
https://www.facebook.com/andrew.roe.3517 it.linkedin.com/in/andrewsroe/
Send a message via MSN to Andy Roe
Post

Rob,

If you have got current drain, likely suspects could be the interior, boot & bonnet lights staying on when the doors, boot(trunk) & bonnet are closed. Make sure the switches work properly when everything is closed.

Andy
__________________
1991 C2 Coupe Zyclam Metallic (L999/82X - match to sample), Ruffled Cashmere Leather, Zyclam coloured dial surround, LWF/RS Clutch, Cup By-Pass, RUF twin tail pipe, KW V3s, H&R sway bars, Carbon Strut Brace & Club Sport Steering Wheel.

Lots of photos here

Rennlist Member No: 030127-2625
Andy Roe is offline   Reply With Quote
Old 04-29-2003, 12:47 PM   #5
Bill Gregory
Super Moderator

Technical Specialist
Rennlist
Lifetime Member
 
Bill Gregory's Avatar
 
Join Date: May 2001
Location: CT
Posts: 5,845
Post

I should have added that I ran across the problem that Andy mentions, where the rear lid lamp stayed on all the time. Poor mans fix of bye bye bulb took care of that.
__________________
1993 C2
Bill Gregory is offline   Reply With Quote
Old 04-29-2003, 01:16 PM   #6
Riccardo
User
 
Riccardo's Avatar
 
Join Date: May 2001
Location: London (England)
Posts: 1,037
Post

Rob,

Join the club!

By the way, you shouldn't just start and leave the 964 idling to keep the battery charged as this is bad for the engine. Better solution is to either disconnect the battery (or fit a battery cut out switch), get a trickle charger, or better yet spend lots of money but get the current drain solved.
Riccardo is offline   Reply With Quote
Old 05-02-2003, 05:45 PM   #7
Ian A
User
 
Join Date: Feb 2003
Location: Manchester, UK
Posts: 30
Post

Rob

If it helps, I tracked my drain problem to a permanently live powered Radio aerial - it should only become live with the ignition switch in the 1st position yet was powered even when the car was shut down and locked.

I discovered this by taking out each fuse from the fusebox (as recommended in the article mentioned at the website listed above), and testing the draw on the battery using a multimeter.
The culprit was the radio/booster circuit (#38 I think) because when removed, this single-handedly stopped the drain, and pointed me in the right direction as to where to begin looking in more detail.

Hope that helps (a bit at least!)

Ian A
Ian A is offline   Reply With Quote
Old 05-02-2003, 09:04 PM   #8
Michael W
User
 
Join Date: Jul 2001
Location: Sunnyvale, CA, USA
Posts: 59
Send a message via AIM to Michael W
Post

The other obvious place to look is the door switch, which happended to me and caused the battery to drain down in 3 days.
When my engine is turned off the window and sunroof are still operable as long as the doors remain closed. Once a door is opened power to the above circuits are disconnected.
The best way to check is to find out if the interior lights turn on when you open the door, and if the windows still operate. If the lights are off and windows still work when door opens, then it is time to replace the door switch.
Michael W is offline   Reply With Quote
Old 05-04-2003, 07:39 PM   #9
Riccardo
User
 
Riccardo's Avatar
 
Join Date: May 2001
Location: London (England)
Posts: 1,037
Post

Michael,

Thats weird what you say about the windows operation. On my car when the ignition is off the windows only open when the doors are open (and so does the sunroof). Doors closed and they don't open anymore.
Riccardo is offline   Reply With Quote
Old 05-05-2003, 03:47 AM   #10
Andy Roe
Addict
Rennlist Member

 
Andy Roe's Avatar
 
Join Date: May 2002
Location: Bologna, Italy
Posts: 3,313
https://www.facebook.com/andrew.roe.3517 it.linkedin.com/in/andrewsroe/
Send a message via MSN to Andy Roe
Post

I agree with Riccardo. On mine, with the ignition off, I can only open the windows if the DRIVERS door is open!
__________________
1991 C2 Coupe Zyclam Metallic (L999/82X - match to sample), Ruffled Cashmere Leather, Zyclam coloured dial surround, LWF/RS Clutch, Cup By-Pass, RUF twin tail pipe, KW V3s, H&R sway bars, Carbon Strut Brace & Club Sport Steering Wheel.

Lots of photos here

Rennlist Member No: 030127-2625
Andy Roe is offline   Reply With Quote
Old 05-05-2003, 03:47 AM
Rennlist



Paid Advertisement
Reply

Tags
2days, batt, batter, battery, car, couple, days, dead, driving, fix, jump, sits, sitting, start, starting

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 12:32 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
Copyright ę 1998 - 2007 Rennlist.com

Advertise on Rennlist - Privacy Statement - Terms of Service - Jobs