Service Battery Charging System

[Samari21]

I have a 2014 Sierra SLT 5.3. I just changed the alternator and now it is giving me a service battery charging system. It wasn’t on before I changed the alternator. The battery is less than a year old as well. 

[m3n00b]

Cool.  Do you have a question?

[davester]

why did you change the alternator?

are you sure you hooked it up correctly?  maybe recheck all the connections that they are clean, tight and fully inserted.

it's also possibly the new alternator is bad out of the box.

[TheRiver]

On 12/20/2025 at 2:08 PM, m3n00b said:

Cool.  Do you have a question?

 

You couldn't figure out what info he wanted from that??

[silveradosid]

is the alternator oem or aftermarket, sometimes you have to do a relearn for the computer to accept the new part

[MikeBMW]

On 12/20/2025 at 1:01 PM, Samari21 said:

I have a 2014 Sierra SLT 5.3. I just changed the alternator and now it is giving me a service battery charging system. It wasn’t on before I changed the alternator. The battery is less than a year old as well. 

I replaced my alternator with a 250 Amp Mechman and, recently, replaced my battery with an AGM.
When you replace your alternator, be sure you run the cables properly.
Also, be sure the "ring" remains on the negative battery cable.
Quick search:
"The "ring" or donut-shaped component on the negative battery terminal of a 2017 Chevrolet Silverado is the battery current sensor, which is part of the vehicle's Electrical Power Management (EPM) or Regulated Voltage Control (RVC) system."
 

Edited December 30, 2025 by MikeBMW