Notices
1999 - 2003 7.3L Power Stroke Diesel  
Sponsored by:
Sponsored by: DP Tuner

7.3 psd battery light on

Thread Tools
 
Search this Thread
 
Old Dec 16, 2005 | 09:46 PM
  #1  
gilamountainman's Avatar
gilamountainman
Thread Starter
|
New User
Joined: Dec 2005
Posts: 9
Likes: 0
Cool 7.3 psd battery light on

Yesterday I noticed that the battery light stayed on while driving to work. I then looked at the battery charge gauge and it roughly was at about 18 volts. I made it back home and didn't think anything was wrong. Today I drove my stroke around the block looking for my wife's escapee terriers and I noticed that the gauge was hovering around 10volts. I made it home and pulled out my trusty volt meter to check the batteries. Both batteries are reading about 11.8 volts. I went ahead and cleaned both cables. I started my truck back up and the battery volt cauge is still hovering around 10 volts. Anybody out there have any idea what could be causing this? also I have full power in the truck meaning my lights are perfectly bright and the stereo works just fine.
 
Reply
Old Dec 16, 2005 | 10:12 PM
  #2  
PSNut's Avatar
PSNut
Postmaster
Joined: Jun 2005
Posts: 3,438
Likes: 0
From: New Hampshire
Originally Posted by gilamountainman
Yesterday I noticed that the battery light stayed on while driving to work. I then looked at the battery charge gauge and it roughly was at about 18 volts. I made it back home and didn't think anything was wrong. Today I drove my stroke around the block looking for my wife's escapee terriers and I noticed that the gauge was hovering around 10volts. I made it home and pulled out my trusty volt meter to check the batteries. Both batteries are reading about 11.8 volts. I went ahead and cleaned both cables. I started my truck back up and the battery volt cauge is still hovering around 10 volts. Anybody out there have any idea what could be causing this? also I have full power in the truck meaning my lights are perfectly bright and the stereo works just fine.
Ouch! 18volts is too high for charging. Can u verify that with a voltmeter. A good battery shows 12.5 volts alone and about 14.5 volts while engine running.
U may need a new regulator.
 
Reply
Old Dec 17, 2005 | 12:19 AM
  #3  
Kwikkordead's Avatar
Kwikkordead
Fleet Owner
Shutterbug
Liked
Loved
Community Favorite
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Replace your alternator before you boil your batteries dry. They are most likely suffering heavily as it is. 18 volts is WAY to high. I agree with PSnut, 14.5 max is what you should see.
 
Reply
Old Dec 17, 2005 | 12:20 AM
  #4  
Kwikkordead's Avatar
Kwikkordead
Fleet Owner
Shutterbug
Liked
Loved
Community Favorite
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Wow, lots of new members tonight!
Welcome to the forum gilamountainman.
 
Reply
Old Dec 17, 2005 | 12:24 AM
  #5  
empiretc's Avatar
empiretc
Lead Driver
20 Year Member
Joined: Dec 2003
Posts: 5,250
Likes: 42
Yeah, alternator. Without a doubt.
 
Reply
Old Dec 17, 2005 | 08:19 AM
  #6  
Trigger's Avatar
Trigger
Junior User
Joined: Jan 2005
Posts: 98
Likes: 0
I agree alternator. Just for a sanity check, measure voltage with your meter when its running.
 
Reply
Old Dec 17, 2005 | 09:59 AM
  #7  
stroker2's Avatar
stroker2
Senior User
Joined: Jul 2005
Posts: 261
Likes: 1
From: North Carolina
Sounds like the voltage regulator in the alternator. If you can spare the downtime on the truck and want to save some money, take your alternator to a place/shop that rebuilds alternators, starters, etc. Have them repair it and also ask them to check it out throughly and give you a price on any improvements they can do to it. Most of those places can "bullit proof" it with better bearings, etc. If they can reasonably priced increase the output to 140-145 amps, that would also be worth it. You'll get a better alternator out of it than you will buying a re-man from some discount auto place and for alot less money.

If you can't wait on rebuilding an alternator, get at least a 130 amp output alternator. From what I've read, many places will try to sell you a 110 amp and you're better off with the 130. You don't need a 150+ amp unless your running alot of lights and add-on stuff, like an ambulance or tow truck.
 
Reply
Old Dec 17, 2005 | 10:14 PM
  #8  
cangim's Avatar
cangim
Postmaster
Joined: Nov 2003
Posts: 3,595
Likes: 0
From: Utah County, UT
I agree alternator as well, but I also feel inclined to mention that you can get a new 200A alternator for just over 200 bucks, there is also some 110A there as well, but I agree 110A seems small. I really like the idea of having is custom rebuilt. 150A would suit my wants perfect.
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-1

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-2

Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-3

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-4

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
story-5

Top 10 Ford Truck Tragedies

 Joe Kucinski
story-6

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

 Brett Foote
story-7

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

 Michael S. Palmer
story-8

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

 Verdad Gallardo
story-9

10 Best Ford Truck Engines We Miss the Most!

 Joe Kucinski
Old Dec 18, 2005 | 12:59 PM
  #9  
dunbar15's Avatar
dunbar15
Senior User
Joined: Apr 2005
Posts: 217
Likes: 0
From: NH
I had the exact same symptom, was my alternator

Good luck
 
Reply
Old Dec 18, 2005 | 07:15 PM
  #10  
PSNut's Avatar
PSNut
Postmaster
Joined: Jun 2005
Posts: 3,438
Likes: 0
From: New Hampshire
Originally Posted by dunbar15
I had the exact same symptom, was my alternator

Good luck
Dis u gat my PM?
 
Reply
Old Dec 20, 2005 | 07:25 PM
  #11  
gilamountainman's Avatar
gilamountainman
Thread Starter
|
New User
Joined: Dec 2005
Posts: 9
Likes: 0
battery light on

Originally Posted by PSNut
Dis u gat my PM?

Guys I had an alternator shop build me a 150 amp for the tune of $180 and replaced my cheap Walmart batteries with two Optimas. The light went back out. thanks for all the info!
 
Reply
Old Dec 20, 2005 | 07:55 PM
  #12  
PSNut's Avatar
PSNut
Postmaster
Joined: Jun 2005
Posts: 3,438
Likes: 0
From: New Hampshire
Originally Posted by gilamountainman
Guys I had an alternator shop build me a 150 amp for the tune of $180 and replaced my cheap Walmart batteries with two Optimas. The light went back out. thanks for all the info!
Cool! Can i ask what the Optima's set u back?
 
Reply
Old Dec 22, 2005 | 11:37 AM
  #13  
gilamountainman's Avatar
gilamountainman
Thread Starter
|
New User
Joined: Dec 2005
Posts: 9
Likes: 0
Spent $130 each.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Nate38654
6.0L Power Stroke Diesel
70
Aug 21, 2016 04:47 PM
1Austin112
1987 - 1996 F150 & Larger F-Series Trucks
8
May 10, 2016 05:11 PM
94-Beast-F350
1987 - 1996 F150 & Larger F-Series Trucks
35
Feb 3, 2016 07:52 AM
jmuenchow
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
12
Nov 18, 2015 02:18 PM




All times are GMT -5. The time now is 12:47 PM.

story-0
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-1
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 09:39:23


VIEW MORE
story-2
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-05-30 18:33:59


VIEW MORE
story-3
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-4
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-5
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-6
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-7
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-8
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-9
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE