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Alternator not charging

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,973 POSTS
Nice work, glad we could be of assistance please use 2CarPros anytime we are here to help.
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Saturday, October 1st, 2016 AT 10:25 AM
Tiny
EMHOKEESE
  • MEMBER
  • 7 POSTS
  • 1975 FORD F-250
  • V8
  • 2WD
  • AUTOMATIC
  • 43,000 MILES
I have replaced the battery the alternator and truck still won't charge runs off the battery untiled drained
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
https://www.2carpros.com/how_to/how_to_test_alternator.htm
Test as in the link, also tell me if you have a regulator mounted on the radiator suppot, or the fender...and we can test it. If voltage drops as you turn on accessories, regulator is no good.
Check email for Ford Regulators and wiring...
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
EMHOKEESE
  • MEMBER
  • 7 POSTS
I don't understand the link, I am a novice at mechanics, the regulator is on fender below the vacuum can, appears to have three prongs only two are connected one wire is yellow can'y tell the other
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
EMHOKEESE
  • MEMBER
  • 7 POSTS
I changed battery I changed alternator I changed voltage regulator, still no charge truck starts then when I take off ground from battery it dies, any ideas
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You need to check the wires that run between the regulator and alternator. I sent several PDF files to your email, Ford used three different type regulators, so check which one you have, if you use a piec of wire and momentarily ground the field terminal, and it charges properly, regulator or wiring is bad. Battery cables could be another problem, connections need to be clean and tight at both ends. Use a voltmeter, testing by removing the cable is NOT as accurate!
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
EMHOKEESE
  • MEMBER
  • 7 POSTS
I discovered my truck has a battery isolator connected to the alternator, can I bypass the isolator since I have only one battery?
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
EMHOKEESE
  • MEMBER
  • 7 POSTS
Thanks for all the help I was able fix the problem, the ballast resistor was a battery isolator once I figured that out it was a piece of cake, again thanks for all the help
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Friday, June 12th, 2020 AT 12:36 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Ok so I assume you removed the isolator and all is well?
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Friday, June 12th, 2020 AT 12:36 PM (Merged)

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