Help with 1998 f-150 , will not charge. - Ford Truck Enthusiasts Forums



1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage

Help with 1998 f-150 , will not charge.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-19-2009, 09:33 PM
Scott1957 Scott1957 is offline
New User
Thread Starter
 
Join Date: Apr 2009
Posts: 1
Scott1957 is starting off with a positive reputation.
Exclamation Help with 1998 f-150 , will not charge.

i have a 1998 ford f150 truck, it will not charge the battery alt. is rebuilt had it checked twice battery is good 12.50 oms. Any ideas?
Reply With Quote
  #2  
Old 04-19-2009, 10:44 PM
Ultramagdan's Avatar
Ultramagdan Ultramagdan is offline
Post Fiend
 
Join Date: Feb 2000
Location: Kansas
Posts: 11,496
Ultramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud ofUltramagdan has much to be proud of
Nice to have you here!

If the alternator checks out OK and the battery is strong are you sure you don't have a short somewhere? When the truck is running, have you checked the alt to make sure it's charging the battery? Voltage regulator?
Reply With Quote
  #3  
Old 04-20-2009, 01:52 PM
GammaDriver's Avatar
GammaDriver GammaDriver is offline
Posting Guru
 
Join Date: Dec 2001
Location: Southeast FLA
Posts: 2,017
GammaDriver is starting off with a positive reputation.
Alternator while running should be higher than 12 volts with most vehicles. 13, or more, would be more like it. Check for the output of the alternator while running (even a bit off idle) and see if you need another rebuilt Alt.
Reply With Quote
  #4  
Old 04-20-2009, 02:24 PM
KingRanchMan02's Avatar
KingRanchMan02 KingRanchMan02 is offline
Posting Guru
 
Join Date: Oct 2005
Location: Louisville, Kentucky
Posts: 2,202
KingRanchMan02 is gaining momentum as a positive member of FTE.KingRanchMan02 is gaining momentum as a positive member of FTE.
When the ignition is off, 12 volts at the battery is normal. When the ignition is on but the engine is not running, battery voltage should be 11 - 12 volts. With the engine running, voltage at the battery should be 13.5 - 15.0 volts.
Reply With Quote
  #5  
Old 04-20-2009, 02:59 PM
Club Wagon Club Wagon is offline
Posting Guru
 
Join Date: Feb 2007
Posts: 2,351
Club Wagon is gaining momentum as a positive member of FTE.
No idea where you get "oms"?

Quote:
Originally Posted by Scott1957 View Post
battery is good 12.50 oms. Any ideas?
KRM02 has got the right idea. My '98 has sat for weeks & the pretty fresh battery still read 12.16 volts. When the key is switched on that dropped to 11.80 volts. Quite obviously charging, after sitting so long & on high idle, it read 14.36 volts.

IMO if you "have a short somewhere" you usually find out about it pretty quickly, especially in the large wires between alternator & battery. Shorts will ultimately pop a fuse/fusible link or smoke the wire until it burns out. More likely is a bad terminal or connection, that produces high resistance. This can fool a voltage regulator, acting like a fully charged battery.
Reply With Quote
  #6  
Old 04-20-2009, 03:29 PM
87 XLT 87 XLT is online now
Postmaster
 
Join Date: Oct 2003
Location: SoCal
Posts: 4,311
87 XLT is gaining momentum as a positive member of FTE.
As club wagon mentioned it might be a blown fuse.

That was the prob on my Explorer when it was'nt charging. Replaced the fuse & problem solved.

Strangely enough the fuse is listed as "Generator/voltage regulator" on my 97 Explorer. Go figure. Tradition I guess.
Reply With Quote
  #7  
Old 04-20-2009, 03:33 PM
KingRanchMan02's Avatar
KingRanchMan02 KingRanchMan02 is offline
Posting Guru
 
Join Date: Oct 2005
Location: Louisville, Kentucky
Posts: 2,202
KingRanchMan02 is gaining momentum as a positive member of FTE.KingRanchMan02 is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by 87 XLT View Post
As club wagon mentioned it might be a blown fuse.

That was the prob on my Explorer when it was'nt charging. Replaced the fuse & problem solved.

Strangely enough the fuse is listed as "Generator/voltage regulator" on my 97 Explorer. Go figure. Tradition I guess.
Nope, Ford classifies the device as a Generator these days.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Battery Light FLHermit 1968-2013 Full Size Vans 1 08-08-2016 10:04 PM
1998 f150 XLT Starting issues izar90 1997 - 2003 F150 5 12-02-2013 07:50 AM
Solar Powered Trickle Chargers 1998F150XLT Other; Brakes, Electrical, Hitches, Weight Distribution & CDL Discussion 14 05-31-2013 03:19 AM
1998 Battery Drain SandR 1997 - 2003 F150 1 12-09-2012 08:31 AM
1998 F150 Electrical problem---need help joefromil 1997 - 2003 F150 15 03-29-2008 10:37 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1998, 97, 98, 99, alt, alternator, battery, charge, charging, f150, ford, fuse, idle, truck, wont

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 On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 03:21 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.