Over voltage and battery draining over night - The Mustang Source - Ford Mustang Forums


2005-2009 Mustang S197 Discussion & News

Over voltage and battery draining over night

Reply
 
 
 
Thread Tools Search this Thread
Old 5/18/17, 08:01 AM   #1
Member
Thread Starter
 
Join Date: May 18, 2017
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Over voltage and battery draining over night

Hello everyone.

so I bought a 2007 mustang GT and when I'm driving around my voltage goes way up(seems to be relative to rpms). It tells me to check my charging system and the battery light comes on. In addition to this my battery has started draining over night, but it holds a charge if I take the battery out. could this be caused by a bad voltage regulator?

Any help would be greatly appreciated.
-Jason
minininja2121 is offline   Reply With Quote
Join The Mustang Source

Join TheMustangSource.com Today - It's Totally Free!

Are you a Ford Mustang fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford Mustang Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your stang, and have a great time with other Ford Mustang fans. Whether your an old timer or just bought your Mustang you'll find that TheMustangSource.com is a great community to join. Best of all it's totally free!

Join TheMustangSource.com Today! - Click Here JOIN FOR FREE


Old 5/18/17, 08:39 AM   #2
Post *****
 
Glenn's Avatar
 
Join Date: August 7, 2006
Location: Lockport il
Posts: 14,018
Thanked 91 Times in 81 Posts
Welcome to TMS. I would start by going to autozone and have them test your charging system. They can test the battery and alt for free. Does your battery at full charge have 13.5 volts or so?
Glenn is offline   Reply With Quote
Old 5/18/17, 09:00 AM   #3
Member
Thread Starter
 
Join Date: May 18, 2017
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Glenn View Post
Welcome to TMS. I would start by going to autozone and have them test your charging system. They can test the battery and alt for free. Does your battery at full charge have 13.5 volts or so?
last I checked it was at 12.76v after the battery was taken out for about 7 hours. And it was at 13.16v when I first took it out.
minininja2121 is offline   Reply With Quote
Old 5/18/17, 05:38 PM   #4
Shelby GT350 Member
 
stupidgenius36's Avatar
 
Join Date: February 1, 2004
Location: Denton, TX
Posts: 2,265
Thanks: 0
Thanked 12 Times in 12 Posts
Do what Glenn said, and have a parts store check the charging system. It sounds to me like the alternator is at fault.

I've had a similar issue with voltage spikes at a specific RPM, which was caused by a faulty alternator.
stupidgenius36 is offline   Reply With Quote
Old 5/19/17, 07:14 AM   #5
Member
Thread Starter
 
Join Date: May 18, 2017
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Had my charging system check and it was in fact a bad VR. Got a new alternator and will let you guys know if that's fixes everything once I install it later today.

Thank you all for your help and speedy responses.
-Jason
minininja2121 is offline   Reply With Quote
Old 5/19/17, 03:28 PM   #6
Mach 1 Member
 
Gravydog316's Avatar
 
Join Date: June 4, 2014
Location: Saskatchewan, Canada
Posts: 938
Thanked 164 Times in 148 Posts
Bad alternator or battery;
mine was draining because the CD player kept trying to load cd's 24/7 lol
got a new battery, & the whole side of the battery cracked & fell off due to the cold lol

good luck!!
keep us informed k
Gravydog316 is offline   Reply With Quote
Old 5/19/17, 04:06 PM   #7
Shelby GT350 Member
 
Cavero's Avatar
 
Join Date: February 13, 2006
Posts: 2,094
Thanked 22 Times in 21 Posts
How up is way up? Definitely sounds like a voltage regulator to me. Unfortunately it's not a serviceable component separate from the alternator. If you replace it, get the 3 phase alternator for 2010 GTs. It's going to be much more reliable than the single phase that came in the 05-09
Cavero is offline   Reply With Quote
Old 5/22/17, 11:19 AM   #8
Member
Thread Starter
 
Join Date: May 18, 2017
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Well I finished up installing my new alternator and everything is good sofar

Thank you all for your input,
-Jason
minininja2121 is offline   Reply With Quote
Old Yesterday, 04:00 PM   #9
Mach 1 Member
 
Scarpi's Avatar
 
Join Date: October 17, 2004
Location: Phoenix, AZ.
Posts: 665
Thanks: 0
Thanked 19 Times in 12 Posts
Quote:
Originally Posted by Gravydog316 View Post
Bad alternator or battery;
mine was draining because the CD player kept trying to load cd's 24/7 lol
got a new battery, & the whole side of the battery cracked & fell off due to the cold lol

good luck!!
keep us informed k
My battery also got drained because the cd player was doing the same thing. The battery I had in the car was one month old from Ford. I took it back to my dealer and they gave me a new battery at no charge. I put it in and all has been fine for the last few months. I still don't know why the cd player was doing that. I haven't played cds in that thing in years. I was thankful that my dealer gave me a free replacment. The cd player has not repeated the problem.
Scarpi is offline   Reply With Quote
Old Yesterday, 04:28 PM   #10
Mach 1 Member
 
Gravydog316's Avatar
 
Join Date: June 4, 2014
Location: Saskatchewan, Canada
Posts: 938
Thanked 164 Times in 148 Posts
Quote:
Originally Posted by Scarpi
My battery also got drained because the cd player was doing the same thing. The battery I had in the car was one month old from Ford. I took it back to my dealer and they gave me a new battery at no charge. I put it in and all has been fine for the last few months. I still don't know why the cd player was doing that. I haven't played cds in that thing in years. I was thankful that my dealer gave me a free replacment. The cd player has not repeated the problem.
Yeah, the cd players are VERY cheap junk!!
The rest of the radio works fine tho;
its probably a good idea to pull the radio fuse if you're gonna park/store it for a long time
Gravydog316 is offline   Reply With Quote
Old Yesterday, 08:52 PM   #11
Shelby GT350 Member
 
Cavero's Avatar
 
Join Date: February 13, 2006
Posts: 2,094
Thanked 22 Times in 21 Posts
Quote:
Originally Posted by minininja2121 View Post
Well I finished up installing my new alternator and everything is good sofar

Thank you all for your input,
-Jason
Nice, which alternator did you get?
Cavero is offline   Reply With Quote
 
 
Reply


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 12:08 AM.


2010, The Mustang Source