crazy 'check charging system' indicator - MustangForums.com

Go Back  MustangForums.com > Ford Mustang Tech > 2005-2014 Mustangs > GT S197 General Discussion
Reload this Page >

crazy 'check charging system' indicator

Notices
GT S197 General Discussion This section is for technical discussions pertaining specifically to the V8 variation of the 2005 and newer Ford Mustang.

crazy 'check charging system' indicator

Reply

 
 
 
Old 09-24-2018, 01:36 PM
  #1  
lmarlo
Thread Starter
 
Join Date: Apr 2007
Location: ca
Posts: 26
Default crazy 'check charging system' indicator

I've read a bunch of posts about this, but I have a question about the duration. I got a new battery more than 3 months ago, and immediately started getting the red battery light and the 'check charging system' indicator. Every time I drive this happens. I clear it, and sometimes it comes back, but most of the time it doesn't happen again during that particular drive. I verified all my connection are OK. I'm going on 4 months with this. The battery turns over really fast when I start the car. It's showing no signs of weakening. Question: How long does it take for the battery to ruin my alternator or the alternator to ruin my battery, or is the warning meaningless?
lmarlo is offline  
Reply With Quote
Old 09-24-2018, 01:42 PM
  #2  
Derf00
6th Gear Member
 
Join Date: Feb 2005
Location: AZ
Posts: 11,360
Default

Your alternator is going out. The "check charging system" warning comes up when the alternator fails to output at least 12.5 volts. Depending on how far it dips and for how long, it can take months to ruin a battery or a few days. Get a volt meter next time the light is on and check the voltage at the battery. A good alternator will output between 13.5 and 14.2 volts. Anything less than that and the alt is going bad.

I picked up a brand new alternator on Amazon by TYC for about $120. It's been 6 months now and is working flawlessly in the AZ heat.
Derf00 is offline  
Reply With Quote
Old 09-24-2018, 01:56 PM
  #3  
lmarlo
Thread Starter
 
Join Date: Apr 2007
Location: ca
Posts: 26
Default

Thanks - I'll head over to Autozone later and check for the numbers you provided. I've noted the Amazon link as well.

Last edited by lmarlo; 09-24-2018 at 01:59 PM.
lmarlo is offline  
Reply With Quote
Old 09-24-2018, 03:10 PM
  #4  
08'MustangDude
4th Gear Member
 
Join Date: Jan 2018
Location: Pennsylvania
Posts: 1,475
Default

Alternator MUST put out 13.5+ to charge the battery. 12.5 is still too low!
08'MustangDude is offline  
Reply With Quote
Reply
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ctuttle
4.6L V8 Technical Discussions
8
10-13-2011 04:21 AM
CruizinConcepts
Cruizin Concepts
4
10-15-2009 12:40 PM
91lxstang
Mustang Videos
5
08-11-2005 05:44 AM
Milky
5.0L (1979-1995) Mustang
14
05-13-2004 01:58 AM

Forum Jump

Thread Tools
Search this Thread
Advertising
Featured Sponsors
Vendor Directory