PUT NEW ALTERNATOR ON AND IT STILL WONT CHARGE

  • Tiny
  • Anonymous
  • 2003 Pontiac Montana
  • 111,111 miles

Put new alternator on and it still wont charge. Drains new battery.

Wednesday, December 5th, 2012 AT 9:45 PM

7 Replies

  • Tiny
  • saturntech9
  • Expert
  • 29,872 posts

Did you have the old alternator tested as bad?Also do you have a multimeter to do some testing?

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Wednesday, December 5th, 2012 AT 9:55 PM
  • Tiny
  • continentals
  • Member

They said it was bad. Do not have multimeter

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Wednesday, December 5th, 2012 AT 10:03 PM
  • Tiny
  • saturntech9
  • Expert
  • 29,872 posts

You need a multi meter so we can trouble shoot the problem.

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Thursday, December 6th, 2012 AT 1:42 AM
  • Tiny
  • continentals
  • Member

Now have multimeter

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Saturday, December 8th, 2012 AT 2:28 PM
  • Tiny
  • saturntech9
  • Expert
  • 29,872 posts

Lets start with the engine idling what is the voltage reading at the battery?

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Sunday, December 9th, 2012 AT 1:44 AM
  • Tiny
  • continentals
  • Member

11.90

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Sunday, December 9th, 2012 AT 1:40 PM
  • Tiny
  • saturntech9
  • Expert
  • 29,872 posts

Alright your not charging there is a red wire going to terminal B+ the one with a nut on there should be battery voltage there at the alternator. Also the orange wire to the D terminal at the alternator should have battery voltage. Let me know what you find?

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Sunday, December 9th, 2012 AT 5:47 PM

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