battery light...stays dim even with motor off - The Mustang Source - Ford Mustang Forums

Go Back  The Mustang Source - Ford Mustang Forums > Mustang by Model Year > Fox Mustangs
battery light...stays dim even with motor off >

battery light...stays dim even with motor off

Fox Mustangs 1979-1993 Mustangs

battery light...stays dim even with motor off

Reply

 
 
 
Old 9/21/10, 05:01 PM
  #1  
Cobra R Member
Thread Starter
 
tom_vilsack's Avatar
 
Join Date: August 7, 2004
Location: Ladner,Canada
Posts: 1,765
Thanks: 0
Thanked 0 Times in 0 Posts
battery light...stays dim even with motor off

*not driven 93 mustang 2.3L for about a month...been outside,and rained alot*

-battery light staying on (bright when keys in motor running...***staying on but dimm,motor off key out***)
-if i pull fuse #18 then the dimm battery light goes out completely
-note...volt meter showing normal and believe charging

any ideas? i understand battery light on,could be alternator...but why does light stay on,all be it dimm even when motor is off and keys out????
tom_vilsack is offline  
Reply With Quote
Old 9/23/10, 10:41 AM
  #2  
FR500 Member
 
David Young's Avatar
 
Join Date: September 16, 2009
Location: Clinton Tennessee
Posts: 3,098
Thanked 37 Times in 34 Posts
I've looked around and can't find what might be causing the light to be on. I had a Volvo many years ago that did the same thing. I just un-did the battery if it was going to sit for the day. I was afraid the light might drain the battery. I did this til the day i sold it for a year or so. The alternator was still working and the battery still started the engine so i never tried to fix it LOL!!!

Maybe check the connections for water or something since it sat for a while before the light started staying on.
David Young is offline  
Reply With Quote
Old 9/23/10, 11:50 AM
  #3  
Post *****
 
Glenn's Avatar
 
Join Date: August 7, 2006
Location: Lockport il
Posts: 14,347
Thanked 133 Times in 118 Posts
Are you talking about the volt meter in the car or a handheld unit? If its the meter in the car, can you get a hold of a hand held voltage tester and let us know how many volts your battery is holding while the car is off? Then again while its running?
Glenn is offline  
Reply With Quote
Old 9/23/10, 08:22 PM
  #4  
Cobra R Member
Thread Starter
 
tom_vilsack's Avatar
 
Join Date: August 7, 2004
Location: Ladner,Canada
Posts: 1,765
Thanks: 0
Thanked 0 Times in 0 Posts
Im talking volt meter in car (dont have a handheld one)

update: red battery light staying on even with car off,and keys out...so i tryed pulling red wire plug from alternator,and light goes out....it's wierd,because volt meter shows alternator charging and car starts and runs fine...but perhaps alternator is slowly going,and battery light on (even when car is off) is it's way of warning driver?????

guess ill have to take alternator off,and have it checked..........
tom_vilsack is offline  
Reply With Quote
Old 10/5/10, 05:45 AM
  #5  
Post *****
 
Glenn's Avatar
 
Join Date: August 7, 2006
Location: Lockport il
Posts: 14,347
Thanked 133 Times in 118 Posts
any updates?
Glenn is offline  
Reply With Quote
Old 10/6/10, 06:47 PM
  #6  
Member
 
mike89's Avatar
 
Join Date: September 13, 2009
Location: Indiana
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Sounds like you have a bad connection somewhere...... if the sensor is not getting enough voltage it would come on like this. It could be due to a loose/corroded connection, bad battery, short in the wiring, or the belt is slipping.
mike89 is offline  
Reply With Quote
Old 10/7/10, 02:25 AM
  #7  
Cobra R Member
Thread Starter
 
tom_vilsack's Avatar
 
Join Date: August 7, 2004
Location: Ladner,Canada
Posts: 1,765
Thanks: 0
Thanked 0 Times in 0 Posts
update:

it was alternator...replaced and now battery light no longer stays on (even with motor off and keys out)

guess some type fox system that warns you non stop if your alternator is bad (which mine was)
tom_vilsack is offline  
Reply With Quote
Old 10/8/10, 12:05 PM
  #8  
FR500 Member
 
Join Date: August 15, 2005
Location: Honolulu
Posts: 3,010
Thanks: 0
Thanked 0 Times in 0 Posts
- or else a typical Fox electrical gremlin... Got to love simple fixes. Wonder if a 3G alternator conversion can be done on 2.3 'Stangs as well.
hi5.0 is offline  
Reply With Quote
Old 12/15/10, 05:35 PM
  #9  
Member
 
01PonyGT's Avatar
 
Join Date: January 23, 2010
Location: Willow Grove, PA
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Yes, you most certainly can use a 3G alt on a 2.3; just need to grind the bracket a bit. I put a 200amp 3G on my '91 2.3 turbo project
01PonyGT is offline  
Reply With Quote
Reply
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Road_Runner
5.0L GT Modifications
64
7/21/16 09:14 AM
09-gt/cs
GT Performance Mods
9
10/15/15 10:03 AM
PonyMuscletang13
2010-2014 Mustang
4
9/29/15 09:40 AM
lakersfreak
2010-2014 Mustang
10
9/28/15 10:43 PM
Evil_Capri
2015 - 2020
2
9/25/15 12:56 PM


Thread Tools
Search this Thread
Featured Sponsors