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Alternator not charging battery?

Tiny
TMAJ9447
  • MEMBER
  • 78 POSTS
Ok yellow white wire has 12v, alt tested with ground light is grounded. Still not charging. Any more thoughts or test I can do. Thanks!
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Friday, January 20th, 2012 AT 4:22 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
SURELY YOU AIN'T DONE THOSE CONTINUITY TESTS BACK TO THE BATTERY "REMOVED" BATTERY CLAMPS THAT QUICK!

THE MEDIC
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Friday, January 20th, 2012 AT 4:30 PM
Tiny
TMAJ9447
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  • 78 POSTS
Okay here is we're I am. When I connect the green red wire to 12 v the alt charges. Trying to trace down why the green red is not getting voltage from the ign. Yellow wire.
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Friday, January 20th, 2012 AT 5:43 PM
Tiny
TMAJ9447
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  • 78 POSTS
I am on a mission today, surely plus I have father in law help.
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Friday, January 20th, 2012 AT 5:46 PM
Tiny
TMAJ9447
  • MEMBER
  • 78 POSTS
Found the issue instrument cluster burnt out. On way to get another will post result soon.
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Friday, January 20th, 2012 AT 5:58 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
If the dash bulb is blown. Youll need to replace it for it 2 charge. You can bypass the voltage reg. With a bypass tool it plugs into the reg. Wiring. It makes the alt. Max charge. If it starts charging you will have to replace the voltage reg.
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Friday, January 20th, 2012 AT 6:52 PM
Tiny
TMAJ9447
  • MEMBER
  • 78 POSTS
Thank for all your help. Replaced instrument cluster and it is now charging! I guess due to age the circuitry has started to separate and the circuits were touching each other. All is good the info and the diagram was a big help thank you very much. It is fixed.
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Friday, January 20th, 2012 AT 8:19 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Good for u
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Friday, January 20th, 2012 AT 10:13 PM
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1988 FORD F-150
  • 94 MILES
Has new alternator but battery will still not charge
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Friday, January 22nd, 2021 AT 11:43 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
There's two generators available for your application. The older design uses an external voltage regulator with four wires in the plug. The newer design has a three-wire regulator bolted to the back of the generator. Which do you have?

If you have the newer design, check for the presence of 12 volts on one of the three plug-in wires, usually a yellow wire. If it's missing, look for a blown fuse, usually a 15 amp.

Does the "battery" warning light on the dash turn on when you turn on the ignition switch?
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Friday, January 22nd, 2021 AT 11:43 AM (Merged)

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