Info center is telling me "battery not charging"?

PAPERCHASER40272

MEMBER
2002 CHEVROLET TRAILBLAZER
4.3L
6 CYL
4WD
AUTOMATIC
260,000 MILES

My issue is the info center is telling me "battery not charging".

•Truck overheated while driving so I pulled over and checked my fluids and found that I was low on oil, but all other fluids/reservoirs were fine.

• Replaced the water pump, thermostat, oil and oil filter.

•overheating issue fixed. Now the battery light and said message appeared.

• Replaced serpentine belt and alternator but nothing changed.

•Battery only reading 11.3Volts (less than one year old) voltage at alternator while running is the same as battery.

Help!

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

Hi,

Have you had the alternator bench tested? It sounds like it may be bad. Also, there is a fusible link between the battery and the alternator. I need to confirm there is power to the alt at the red wire on it. Check this with everything off.

I attached the wiring schematic below for the charging system. Check that for me and let me know what you find. Also, here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Take care,

Joe

See pics below.

Images (Click to make bigger)