help alt wont charge

98s10bb · 08-21-2008, 12:45 AM

My bat light came on earlier so i drove home and replaced the alternator with one i had at home. started the truck up, still doesnt charge, checked power at the b+ terminal, good, ground good but no power at the 1 wire connector. first thing i did next was replaced the fuse, still no power. looked on the diagram i have from shopkey, and since i have my stock pcm, replaced it. still no luck. i have power coming to the fuse and the trouble chart is no help. hopefully someone here can so i can get to work tomorrow.

Mikey08 · 08-21-2008, 04:36 PM

replace it...Got mine at NAPA with a lifetime warranty

kdnybtr · 09-09-2008, 10:54 PM

its not the alternator, its the pcm. i had the same exact problem. to test take a jumper wire and jump out the generator of the alternator(or the switch). it should be the red wire with the harness. watch your gauge and if power jumps up to 14v then you know your alternators fine. jump it off the ignition just for testing purposes

Joker Relentless · 09-09-2008, 11:15 PM

I just had this happen a couple of months ago. My alternator died and I didn't notice until my battery light came on. By that time I had already drained my battery so bad that I couldn't get it to take a charge, so I had to replace it too.

Hoss · 09-10-2008, 01:21 AM

Is it possible that the spare you had could coincidentally be bad too? Take them to your local Advance or Autozone, you can get them tested and at least rule out possibilities.

98s10bb · 09-12-2008, 11:41 PM

Quote: Originally Posted by Hoss

Is it possible that the spare you had could coincidentally be bad too? Take them to your local Advance or Autozone, you can get them tested and at least rule out possibilities.

Hahahaha your the winner, the spare I had laying around was bad and on top of that the brand new napa alternator was bad as well which was giving me so much trouble. got it figured out the next day when i bought an delco alternator from the stealership

Joker Relentless · 09-13-2008, 12:56 AM

I hate buying anything with Napa's name on it. It seems to always be shit for some reason, at least that's my luck with Napa stuff.

Glad you got it all sorted out anyway.

08-21-2008, 12:45 AM	#1
98s10bb Registered User Join Date: Aug 2007 Posts: 70 Location: User is: OffLine	help alt wont charge My bat light came on earlier so i drove home and replaced the alternator with one i had at home. started the truck up, still doesnt charge, checked power at the b+ terminal, good, ground good but no power at the 1 wire connector. first thing i did next was replaced the fuse, still no power. looked on the diagram i have from shopkey, and since i have my stock pcm, replaced it. still no luck. i have power coming to the fuse and the trouble chart is no help. hopefully someone here can so i can get to work tomorrow.
	[Reply w/Quote]

08-21-2008, 04:36 PM	#2
Mikey08 Registered User Join Date: Aug 2007 Posts: 713 Location: User is: OffLine	Re: help alt wont charge replace it...Got mine at NAPA with a lifetime warranty
	[Reply w/Quote]

09-09-2008, 10:54 PM	#3
kdnybtr Registered User Age: 27 Join Date: Dec 2007 Posts: 10 Location: maryland User is: OffLine	Re: help alt wont charge its not the alternator, its the pcm. i had the same exact problem. to test take a jumper wire and jump out the generator of the alternator(or the switch). it should be the red wire with the harness. watch your gauge and if power jumps up to 14v then you know your alternators fine. jump it off the ignition just for testing purposes
	[Reply w/Quote]

09-09-2008, 11:15 PM	#4
Joker Relentless I AM THE PENGUIN OF DEATH Age: 25 Join Date: Feb 2005 Posts: 2,989 Location: Southside of Hell User is: OffLine	Re: help alt wont charge I just had this happen a couple of months ago. My alternator died and I didn't notice until my battery light came on. By that time I had already drained my battery so bad that I couldn't get it to take a charge, so I had to replace it too.
	[Reply w/Quote]

09-10-2008, 01:21 AM	#5
Hoss GM junkie Age: 28 Join Date: Jan 2003 Posts: 397 Location: Dayton, MD User is: OffLine	Re: help alt wont charge Is it possible that the spare you had could coincidentally be bad too? Take them to your local Advance or Autozone, you can get them tested and at least rule out possibilities.
	[Reply w/Quote]


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09-12-2008, 11:41 PM	#6
98s10bb Registered User Join Date: Aug 2007 Posts: 70 Location: User is: OffLine	Re: help alt wont charge Quote: Originally Posted by Hoss Is it possible that the spare you had could coincidentally be bad too? Take them to your local Advance or Autozone, you can get them tested and at least rule out possibilities. Hahahaha your the winner, the spare I had laying around was bad and on top of that the brand new napa alternator was bad as well which was giving me so much trouble. got it figured out the next day when i bought an delco alternator from the stealership
	[Reply w/Quote]

09-13-2008, 12:56 AM	#7
Joker Relentless I AM THE PENGUIN OF DEATH Age: 25 Join Date: Feb 2005 Posts: 2,989 Location: Southside of Hell User is: OffLine	Re: help alt wont charge I hate buying anything with Napa's name on it. It seems to always be shit for some reason, at least that's my luck with Napa stuff. Glad you got it all sorted out anyway.
	[Reply w/Quote]

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