Battery light question - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 11-22-2010
dadof2's Avatar
Member
Thread Starter
 
Join Date: Sep 2010
Location: Olathe, KS
Posts: 43
Battery light question

The battery light came on the truck last week (right before my got a little loose in it and put through a fence!). I have had the battery and alternator tested, and both test fine. The headlights don't flicker, and it cranks over just fine.

Any idea as to what can be causing the light to come on?

99 reg cab 3.0 4x4 auto no mods yet

Thanks
Reply With Quote
  #2  
Old 11-22-2010
k.blakeley's Avatar
Member
 
Join Date: Apr 2007
Location: East Texas
Posts: 2,823
Faulty votage regulator. Mine would be at 14.1 for a good while then drop to 12.2 for 10 secs then kick back up to 14.1. The batt light would either flicker or stay on for a few minutes.
Reply With Quote
  #3  
Old 11-22-2010
dadof2's Avatar
Member
Thread Starter
 
Join Date: Sep 2010
Location: Olathe, KS
Posts: 43
I'll have to check that out tonight. Thanks

Wait, is the v.r. built into the alternator?
Reply With Quote
  #4  
Old 11-22-2010
k.blakeley's Avatar
Member
 
Join Date: Apr 2007
Location: East Texas
Posts: 2,823
Yes,its the tan looking box thingy in the back. Just get a new one or have yours rebuilt.
Reply With Quote
  #5  
Old 11-22-2010
ccernst's Avatar
Member
 
Join Date: May 2009
Location: Kansas City, MO
Posts: 380
measure the voltage across your battery when running. I think it should be above 13.8 volts.

If you take it in to a auto parts shop to have it tested, they only test at one rpm. I had a Grand Am that when you got above 3k rpms, the lights would cut out and all electrical had real problems. Tested fine at the shop. Brought it home and voltage dropped when rpms went high. Shop must not have turned the alternator fast enough to produce the problem.
Reply With Quote
  #6  
Old 12-04-2010
Member
 
Join Date: Mar 2010
Location: G-town NY
Posts: 4
Lets add a twist to this! how about when doing down hill or when you go to pass someone and kick it down a gear. Lights dim and battery light comes on. Tested the VR and ran at 14, battery tested at 12.5.
Reply With Quote
  #7  
Old 12-06-2010
Rolldogg's Avatar
Member
 
Join Date: Jan 2006
Location: Ottawa, Ontario
Posts: 3,424
Might even be as simple as cleaning your battery terminals. Sounds like the battery is holding a good charge and that the alternator is charging correctly too.
Reply With Quote
  #8  
Old 12-06-2010
dadof2's Avatar
Member
Thread Starter
 
Join Date: Sep 2010
Location: Olathe, KS
Posts: 43
Def could be the battery terminals. I haven't had a chance to look at it though. Maybe this weekend.
Reply With Quote
  #9  
Old 12-06-2010
k.blakeley's Avatar
Member
 
Join Date: Apr 2007
Location: East Texas
Posts: 2,823
Quote:
Originally Posted by Bugs View Post
Lets add a twist to this! how about when doing down hill or when you go to pass someone and kick it down a gear. Lights dim and battery light comes on. Tested the VR and ran at 14, battery tested at 12.5.
SOme alts when on their last leg will drop votage when spun in higher RPMs.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1996 Battery light coming on, yet battery and alternator work' SariahLeah SOHC - 2.3L & 2.5L Lima Engines 2 06-04-2010 04:16 PM
battery light ABS light dim light RangerSkippyRoo General Technical & Electrical 3 05-25-2009 11:25 AM
NOT a Ranger Light Question, but still a Ford Light Question buggman General Technical & Electrical 1 11-19-2008 12:00 PM
Battery Light Question NVR2FST General Technical & Electrical 5 01-04-2008 09:11 AM
running battery down, battery discharge from playing an amp'd system onebluemcm Audio & Video Tech 12 04-13-2007 04:48 PM


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



All times are GMT -6. The time now is 02:24 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.