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Alternator/Battery problem???

gth

By gth
in Ask A GM Technician

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gth New Member

gth

Posted
Posted

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.

davegee Enthusiast

davegee

Posted
Posted
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 is common for alternator to take battery out or battery to take alternator out. By what you have said, I would almost guarantee you need both. As you are a fellow Canuck, you can get your alternator to "Ukranian Tire" and have them test it.

davegee Enthusiast

davegee

Posted
Posted
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.

 

 

 

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
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???

 

a weak battery can cause a constant strain on the alternator and eventually the alternator gives up. See it a lot.

gth New Member

gth

Posted
  • Author
Posted

Oh well, whats another $300 for an alternator with a 5 year warrenty...........I just paid almost $40 for a case of beer and it wont last the weekend. :cheers::cry::D

 

 

Any Ideas on where to buy one for a reasonable price here in Kanuckistan. (I'm up North so we dont have all the big chains)

davegee Enthusiast

davegee

Posted
Posted
Oh well, whats another $300 for an alternator with a 5 year warrenty...........I just paid almost $40 for a case of beer and it wont last the weekend. :confused:  :cheers:  :D

 

 

Any Ideas on where to buy one for a reasonable price here in Kanuckistan. (I'm up North so we dont have all the big chains)

 

 

 

 

I'd just do a little shopping around....you definitely get what you pay for. I like the 5 year warranty idea, and some places will install it 4 u ...not that it's hard.

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