WHY IS MY ALTERNATOR NOT CHARGING MY BATTERY EVEN THOUGH MY ALTERNATOR TESTED GOOD AND MY BATTERY IS BRAND NEW

  • Tiny
  • Joebates29
  • 1999 Lexus ES 300
  • 132,000 miles

The Voltage Regulator test fails but when I remove my alter or from my car and have the
Test it tests good. What could be the problem?

Wednesday, November 23rd, 2011 AT 12:33 AM

3 Answers

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

Have you checked the fuseable link between the battery and alt?

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Wednesday, November 23rd, 2011 AT 12:38 AM
  • Tiny
  • Joebates29
  • Member

No I haven't. How do I do that?

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Wednesday, November 23rd, 2011 AT 12:58 AM
  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

Basically, there is a wire between the alt and battery. It looks like a regular wire, but it has a fuse built into it. If it is bad, no power from the alt can get to the battery.

I attached a wiring schematic for you to review of the charging system. Look off the battery and you will see the one I am refering to.

Let me know if this helps.
Joe
PS: Happy Thanksgiving!

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Wednesday, November 23rd, 2011 AT 1:06 AM

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