2003 Chevrolet Tahoe overcharging

Tiny
MISA
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
2003 chevy tahoe I just replace battery and alternator and its still shows overcharging.
Monday, July 21st, 2014 AT 5:53 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,454 POSTS
Okay, how many volts is it producing? As far as the alt, the voltage regulator is internal and not serviceable. The regulator controls the field current of the rotor to limit system voltage. Overcharging, then, is caused by a faulty regulator. However, I need you to do a simple check.

With the engine off, open the hood and check the battery voltage. It should be slightly over 12v. Have a helper start the engine and recheck the battery voltage. It should be in the area of 14v.

Let me know what you find.
Was this
answer
helpful?
Yes
No
Monday, July 21st, 2014 AT 6:20 PM
Tiny
FREEMBA
  • MECHANIC
  • 1,152 POSTS
Have the charging system checked at an auto parts store which does these check for free. Sometimes the vehicles' gauge will read incorrectly.
However, if the vehicle gauge is correct the charging system check can help pinpoint the problem.
Was this
answer
helpful?
Yes
No
-3
Monday, July 21st, 2014 AT 6:51 PM

Please login or register to post a reply.

Sponsored links