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02 Sonata battery discharging at idle

Tiny
DONNELJ
  • MEMBER
  • 2002 HYUNDAI SONATA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 134,000 MILES
I have a 2002 sonata and my battery discharges at idle. It charges when I increase rpm to around 1500. Is this definitely the alternator or could it be something else?
Monday, December 27th, 2010 AT 8:08 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
The regulator inside aLT has faulty diode and needs higher RPM to supply Exciter voltage
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Monday, December 27th, 2010 AT 8:22 PM
Tiny
DONNELJ
  • MEMBER
  • 2 POSTS
Does that mean the alternator needs to be replaced or is the regulator something that can be replaced?
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Tuesday, December 28th, 2010 AT 8:19 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Generaly ALT is replaced regulator is built into ALT. The labor to remove and rebuild would exceed cost of ALT
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Tuesday, December 28th, 2010 AT 8:47 PM

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