Flickering battery light - Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 19 Old 07-15-2009, 11:43 AM Thread Starter
Compression Ignition Addict
 
OregonStroker's Avatar
 
Join Date: Mar 2007
Location: Portland Oregon
Posts: 2,023
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 1 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Flickering battery light

Drove to the coffee shop this morning. When I pulled into my driveway when I got home I noticed the battery light was flickering. Grabbed my multi meter and checked the posts while running. The alternator is only putting out 12.5 Volts at idle. Shouldnt it be around 14? When the truck is off, the battery posts measure 12.3-12.4 so Im assuming the batteries are fine. Any help would be appreciated. Im pretty sure its the alternator, but want to make sure before spending 175 bucks....

thanks

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dont brake.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
OregonStroker is offline  
Sponsored Links
Advertisement
 
post #2 of 19 Old 07-15-2009, 11:54 AM
scuffs *****

 
Tyler's Avatar
 
Join Date: Aug 2008
Location: Oakwood, OH
Posts: 5,270
Thanks: 0
Thanked 10 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to Tyler
You should see 14.3 ish numbers. I'd have the alt tested asap.

Sr. Engineering Tech/OPS Technician @ Your local cable company.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune |
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
Tyler is offline  
post #3 of 19 Old 07-15-2009, 12:08 PM
Powerstroke.org Rookie
 
Join Date: May 2009
Location: Oregon City
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I had the same thing happen to me. A new alternator fixed the problem. The only thing the battery light reacts to is the voltage from the alternator which should be in the 14.3 range like Tyler said.

Early '99 S-Cab 7.3l tuned by PHP; 2003 Excursion 6.0l PHP Atlas 40
colekym is offline  
post #4 of 19 Old 07-15-2009, 12:10 PM
ADMIN AND TECH


 
SCUFFY828's Avatar
 
Join Date: Oct 2006
Location: winston salem north carolina
Posts: 9,318
Thanks: 0
Thanked 11 Times in 11 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
alternator


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

ITS STOCK
SCUFFY828 is offline  
post #5 of 19 Old 07-15-2009, 12:26 PM
Compression Ignition Addict
 
burmad69's Avatar
 
Join Date: Jul 2008
Location: CENTRAL WISCONSIN
Posts: 418
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Dont rush into buying a new alt. yet check the wiring connections first at our dealership we replace them quite often

1997 F-350 PSD CREW LONG BED, BANKS DOWN PIPE,CUSTOM EXHAUST,BANKS TRANS-COMMAND, EGT,BOOST,TRANS TEMP.FPR SHIM, GUAGES.PIAA DRIVING LIGHTS,MY CUSTOM INTAKE,DIY INJECTORS



My house is guarded by SMITH&WESSON 4 nights a week. You Guess Which Ones!


I DONT DIAL 911



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
burmad69 is offline  
post #6 of 19 Old 07-15-2009, 01:18 PM Thread Starter
Compression Ignition Addict
 
OregonStroker's Avatar
 
Join Date: Mar 2007
Location: Portland Oregon
Posts: 2,023
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 1 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
ya ive tested everything, the connections are still shiny clean from the last time I cleaned them up and coated them in anti-bacterial ointment. I used the battery ground (as a ground) and used the charge post coming out of the back of the alternator to see what its producing. (it should show the same on the posts either way I know...) and I can only get 12.88 at idle with nothing on. It holds at 12 with every thing turned on. So it is obviously the alternator. Bumber.... they are kinda spendy.

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dont brake.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
OregonStroker is offline  
post #7 of 19 Old 07-15-2009, 01:20 PM
Compression Ignition Addict
 
symbols's Avatar
 
Join Date: Oct 2007
Location: Pasadena, TX
Posts: 6,505
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
If it's an aftermarket sometimes they will do that. Mine did that for over a year before I replaced it. For whatever reason the only alts that are trouble free for our trucks is the OEM

Jason

"Using a thug's murderous rampage to call for gun control is like using Barack's reckless spending to call for higher taxes."

--Michael Berry, American philosophizer & Talk Radio Czar, 1970-?
symbols is offline  
post #8 of 19 Old 07-15-2009, 01:20 PM
scuffs *****

 
Tyler's Avatar
 
Join Date: Aug 2008
Location: Oakwood, OH
Posts: 5,270
Thanks: 0
Thanked 10 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to Tyler
Just have it rebuilt, its cheaper than brand new.

Symbols has a point. I put an aftermarket one on mine, and it chewered up two alts in 5 months. So I bought a brand new one from FORD for $400. Never a single problem.

Sr. Engineering Tech/OPS Technician @ Your local cable company.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune |
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
Tyler is offline  
post #9 of 19 Old 07-15-2009, 01:25 PM Thread Starter
Compression Ignition Addict
 
OregonStroker's Avatar
 
Join Date: Mar 2007
Location: Portland Oregon
Posts: 2,023
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 1 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
i hear the one napa sells is pretty solid.

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dont brake.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
OregonStroker is offline  
post #10 of 19 Old 07-15-2009, 01:26 PM
scuffs *****

 
Tyler's Avatar
 
Join Date: Aug 2008
Location: Oakwood, OH
Posts: 5,270
Thanks: 0
Thanked 10 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to Tyler
NAPA has good stuff. Check it out.

Sr. Engineering Tech/OPS Technician @ Your local cable company.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune |
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
Tyler is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome