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98 F-250 won't charge battery

Tiny
BCMULLEN95
  • MEMBER
  • 1998 FORD F-250
I have a 1998 Ford F250 3/4 ton 2WD V8 4.6L 254,586 miles.
I have replaced he battery, alternator, and battery cables as well as the connector for the alternator. I have tested the VDC's on the battery they show 12.5-12.8 while engine is off. While the engine is on the VDC's dropped to 12.3-12.1. All the wires leading to the alternater tested good. Bypassed the fuse, but the VDC's on the battery did not increase.
All the fuses have been checked and are okay.
What can it be I am puzzled.
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Sunday, June 17th, 2007 AT 2:23 AM

8 Replies

Tiny
BCMULLEN95
  • MEMBER
  • 248 POSTS
On the new pig tail I purchased I have the yellow/ white wire which is connected to the orange/ light blue wire. The connection are all saudered together.
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Sunday, June 17th, 2007 AT 11:57 AM
Tiny
BCMULLEN95
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  • 248 POSTS
The wires are to be tested while the truck is running and disconnected from the alternator. I check all three the connectors at the altenator as well as the wire harness. : :|
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Sunday, June 17th, 2007 AT 1:23 PM
Tiny
BCMULLEN95
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I tested the results and the orange/light blue is 12v.
However the green/ red was under 1.0v, and the white/black wire was 0v. This is with the new pig tail. Would there be a problem if the colors do not match but the connecters end matches up. I will allatch the old connector and see if I get the reading you suggested. :Wink: :
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Sunday, June 17th, 2007 AT 1:24 PM
Tiny
BCMULLEN95
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I am testing the wires only not the alternator
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Sunday, June 17th, 2007 AT 1:49 PM
Tiny
BCMULLEN95
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The orange/light blue show 12.4v the same as the battery. The green/red show 0v, the white black show ov as well. Now were does this leave me?
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Sunday, June 17th, 2007 AT 2:13 PM
Tiny
BCMULLEN95
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Missing that fuse. I think it is a 30amp put one in the green/red wire reads 12v the white/black reads 0v. I believe that fuse number 5 is also missing do you know what that amp might be. I have no owners manuel and the book I have does not tell me?
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Sunday, June 17th, 2007 AT 2:30 PM
Tiny
BCMULLEN95
  • MEMBER
  • 248 POSTS
Hey thanks, I don't think I would have found those missing fuses if you didn't suggest fuse # 19. I bought this truck not knowing there was this problem. Thank you for all your help it is much appreciated. The voltage reading jumped to 14.0v with light on high and fan on high it jumped to 13.6v
Thank you again :) :D :P
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Sunday, June 17th, 2007 AT 3:54 PM
Tiny
BCMULLEN95
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Thanks, already have told some others about this site. It is absolutely wonderful. Thanks again
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Monday, June 18th, 2007 AT 10:32 AM

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