gth
12/29/2006 5:41:23 PM
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.
48fan
12/29/2006 7:46:26 PM
It is very possible that your Alternator going bad was what caused your battery to go bad. If your Alternator does not charge your battery correctly then your battery will start to sulfate and the surface area of the lead plates will be reduced causeing your battery to not hold a charge.
With your truck running, check to see what your Alternator output is.
gth
12/29/2006 7:50:03 PM
I checked it by plptting the + wire from my multimeter on the Positive wire coming out the back of the alternator and the - wire from my multimeter on the neg terminal of the battery and got 11.47V....
I also checked from the pos wire in back of the starter to a remote grounded object and got 11.47V
Thnaks for the help...
48fan
12/29/2006 7:52:30 PM
I just reread your post and you said that you read 11.3V accross the batt terminals; you should have read 13.8V to 15.3V with the vehicle running. Your alternator is either toast or the connections to your alternator are bad.
golfer
12/30/2006 10:13:36 AM
quote:
ORIGINAL: gth
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.
It's your charging system.
A faulty battery can destroy an alternator and a faulty alternator can destroy a battery.
