4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Help with battery draining!

Thread Tools
 
Search this Thread
 
Old 05-31-2009, 03:45 PM
  #1  
Tyler2001GT
1st Gear Member
Thread Starter
 
Tyler2001GT's Avatar
 
Join Date: May 2009
Location: Colorado
Posts: 62
Default Help with battery draining!

Hey guys recently I have been having a problem with my battery draining slowly overnight. It gets down low enough to where it can just start and sometimes if it sits for a few days it will get so low it cant even start. I just replaced the battery about 2 weeks ago, so I know the battery itself is good. I also just got the alternator tested and its good also. So it has to be something that is physically draining the battery slowly.

Now when i bought the car about 2 months ago they told me that it had an after market "Viper" security system installed in the car. One of the features it has is that before each time I want to start the car I have to press the unlock button on the remote. Also with this security system there is a little LED that was in stalled on the dash (pic below) and this little light flashes all night long so this could be one of the problems. here is a pic of the little light.



Also, one thing that I have noticed is that the on the stereo the little rectangle box that has the time in it (pic below) is always hot. When I come out to the car in the morning this little part is hot so there has to be power going to it. Here is a pic of what im talking about



Any input or help you guys have as to why my battery is being drained or how to stop this is much appreciated.

Thanks!

Last edited by Tyler2001GT; 05-31-2009 at 04:11 PM.
Tyler2001GT is offline  
Old 05-31-2009, 03:55 PM
  #2  
zero2005
4th Gear Member
 
zero2005's Avatar
 
Join Date: Nov 2007
Location: NJ / MA
Posts: 1,337
Default

I would check the wiring to both the stereo and the viper system. its probably grounded out somewhere.

i bought a cheapo head unit and a harness that you had to splice together -- but recently i had to pull the unit out because it was also making my battery drain, and it eventually caused the speakers to emit high pitched noises when i tried to start it...

i did this on the cheap and at the time i didnt have any crimpers or solder or wire nuts, so i just twisted them together and wrapped them in electrical tape, worked fine for a year, but the tape eventually came off on some of the wires and now i have no bass. when i get the chance im gunna get in there again and rewire everything correctly.
zero2005 is offline  
Old 05-31-2009, 09:04 PM
  #3  
califas_1987
3rd Gear Member
 
califas_1987's Avatar
 
Join Date: Jun 2007
Location:
Posts: 516
Default

+1 on an exposed wire somewhere that is hitting the chasis and draining your battery.

Try pulling the fuse on the alarm, and see if that stops the battery from draining. I don't know much about alarms, but check your manual and see how pulling the fuse from it will affect your system if any.
califas_1987 is offline  
Old 05-31-2009, 09:20 PM
  #4  
Aereon
5th Gear Member
 
Aereon's Avatar
 
Join Date: Aug 2005
Location: SF Bay.
Posts: 3,035
Default

it's most likely the exposed wire, could also be a faulty battery(dead cell.. etc.) have it checked out at a kragens while your at it.
Aereon is offline  
Old 05-31-2009, 10:14 PM
  #5  
Tyler2001GT
1st Gear Member
Thread Starter
 
Tyler2001GT's Avatar
 
Join Date: May 2009
Location: Colorado
Posts: 62
Default

Originally Posted by Aereon
it's most likely the exposed wire, could also be a faulty battery(dead cell.. etc.) have it checked out at a kragens while your at it.
I got the battery tested at the place just bought it and it passed so the battery is good....
Tyler2001GT is offline  
Old 05-31-2009, 10:19 PM
  #6  
mindtrix2010
 
mindtrix2010's Avatar
 
Join Date: May 2009
Location: AR
Posts: 6
Default

do a parasitic drain test.
mindtrix2010 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
BOB ROME
5.0L (1979-1995) Mustang
3
07-26-2023 01:54 PM
4cylinderplus2
V6 (1994-2004) Mustangs
10
10-09-2020 07:45 PM
jerrytubes
2005-2014 Mustangs
2
10-23-2015 12:11 PM
wraith777
General Tech
1
09-28-2015 10:49 AM
logan409
4.6L (1996-2004 Modular) Mustang
10
09-26-2015 07:43 PM



Quick Reply: Help with battery draining!



All times are GMT -5. The time now is 06:38 AM.