Chevy Silverado/ GMC Sierra Forum Discuss the Chevrolet Silverado and GMC Sierra here.

2009 GMC Sierra alt voltage

  #1  
Old 11-08-2011, 09:52 AM
Junior Member
Thread Starter
Join Date: Nov 2011
Posts: 2
Default 2009 GMC Sierra alt voltage

My truck is charging at 14.93 volts. battery is brand new. Is this rate to high and if so what should the charging voltage be? above voltage is at idle.
 
  #2  
Old 11-08-2011, 10:12 AM
Senior Member
Join Date: Jan 2010
Posts: 124
Default

14.93 seems a little high to me. 14.2 is normal. I assume you are reading voltage with a DVM? Check with no load (engine running,nothing on) and again full load (engine running everything on).
 
  #3  
Old 11-08-2011, 01:08 PM
Junior Member
Thread Starter
Join Date: Nov 2011
Posts: 2
Default

checked with load and no load voltage same between 14.90 and 15 volts
 
  #4  
Old 11-08-2011, 11:58 PM
NullHead's Avatar
TruckForum Addict
Join Date: Apr 2011
Location: Detroit, MI
Posts: 1,227
Default

I'd say don't mess with it. Your alternator is charging your battery.

What you'll be looking for, is the voltage to go down a bit after running the truck for a while after starting it. The alternator should back off a bit once your battery is charged up again.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
nebulis
Chevy Silverado/ GMC Sierra Forum
2
11-28-2009 08:54 AM
ksoffroadtoy
Toyota Tundra
4
07-12-2008 06:25 PM
jettinjoeyng
Automotive Parts for sale
0
05-02-2008 01:20 AM
97 chevy
General Motors Tech
0
10-05-2007 06:35 PM
87 F350 banks
Ford Heavy Duty
0
09-06-2007 07:35 PM


Thread Tools
Search this Thread
Quick Reply: 2009 GMC Sierra alt voltage


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.