I have a 2000 silverado ext 4x4 5.3l that I have been having a little problem with.
A few days ago I was driving and noticed the battery light come on and the volts gauge was reading around 10 -11volts. I turned off all accessories and headed her for home.
Once home I took the battery (delco factory) to Canadian tire for them to test it. It tested ""replace". So I did with a new 875cca terminator battery. When I installed the new battery the truck started fine but I noticed the battery warning light was still on. I let it run for 20min or so to see if it would charge. (or what ever was wrong might magically fix itself) The light didnt go out so I tried some of the accessories to put a load on it. The wipers and blower motor ran but noticeably slowly.
I just decided to let the truck run with all accessories off. The battery light didn't go out so after running for 1/2 hour or so I shut off the truck and the the battery now shows 11.7V across the terminals.
I charged the battery back up to show 12.6V across the terminals.
Then I started the truck and checked the voltage across the terminals with the truck running (no access on at all)......11.3V....What the.....and the bleeping battery warning light is still on.
I tried revving the truck to 2000-2200 rpm (no access on at all) and the voltage across the battery went up to 11.49 at one point but it also fluctuated down to 11.27 also....
Does this sound like a new alternater to go along with my new battery???? What are the odd that both the battery and alternator would crap on the same day???
PS. I have never had another issue with this truck until this.