Alternator won't charge - JeepForum.com

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post #1 of 18 Old 05-29-2016, 01:52 PM Thread Starter
Gagewebb
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Alternator won't charge

Just replaced the alternator on my Chevy 350 and I can't get it to charge. It charged for a little bit right after first start up but then it's like it died again. Power to it is good. Ground is good. All other wiring is good. It was remanufactured and I have another one on the way. But maybe one of you guys can help me. I'm not too mechanically inclined.

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post #2 of 18 Old 05-30-2016, 09:17 AM
LumpyGrits
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Cj

How did you measure the current from the alt?
How old is the battery.
LG

Have'n you along, is like loose'n 2 good men
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post #3 of 18 Old 05-30-2016, 09:53 AM Thread Starter
Gagewebb
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Just used a metef and the battery is brand new. It's currently dead since my previous alternator wasn't fully charging.
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post #4 of 18 Old 05-30-2016, 06:43 PM
oilsuckin_jk
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Check the belt to make sure it's tight enough. I thought I had a bad battery when I bought my CJ but soon realized that the belt was a little loose and wasn't letting the alternator charge it
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post #5 of 18 Old 05-30-2016, 07:05 PM Thread Starter
Gagewebb
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Tried all different belt tensions and belt is in good shape.
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post #6 of 18 Old 05-30-2016, 07:31 PM
jeepdaddy2000
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Can't help with anything till we know which alternator you have.....

bazinga
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post #7 of 18 Old 05-30-2016, 08:15 PM Thread Starter
Gagewebb
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Ultima 01-0217
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post #8 of 18 Old 05-30-2016, 09:50 PM
Spieg8
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When you say power is good to the alternator, which power are you talking about? There are 3 connectors on the alternator which are powered at least part of the time. Which wires have current and when (key on / key off)?

When I was younger, I thought I was Don Quixote... turns out I'm just another donkey-hootie.
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post #9 of 18 Old 05-30-2016, 10:47 PM
jeepdaddy2000
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Quote:
Ultima 01-0217
GM 10SI
Insure it is wired correctly.
You need to check to see if you have power to post 1 (A common issue is the alternator light burning out). If not then you found your issue
You can jump the battery to post 1 and see if it will start charging
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post #10 of 18 Old 05-30-2016, 11:57 PM Thread Starter
Gagewebb
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Power to battery and 2 are good. I traced 1 back and all wiring seemed fine. The previous alternator would still charge. But couldn't fully keep up. I changed nothing for this new alternator besides a new bracket and ground wire. And no charge whatsoever. So I'm led to the assumption I have a faulty alternator.
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post #11 of 18 Old 05-31-2016, 04:14 AM
Cutlass327
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You said the battery is dead... Always charge a battery before running a new alternator as it can burn itself out trying to charge a dead battery. Delco Remy has that note in their instructions for their alternators.

Rick

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post #12 of 18 Old 05-31-2016, 05:53 PM
LumpyGrits
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Quote:
Originally Posted by Cutlass327 View Post
You said the battery is dead... Always charge a battery before running a new alternator as it can burn itself out trying to charge a dead battery. Delco Remy has that note in their instructions for their alternators.
THIS X 1000.
Fastest way to kill an alt, is to use it to charge a totally dead battery.
LG

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post #13 of 18 Old 06-02-2016, 12:19 PM
CSP
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A bench test of the alternator at an auto parts store is the easiest way to troubleshoot this one.
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post #14 of 18 Old 06-03-2016, 01:46 PM Thread Starter
Gagewebb
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Okay so I took it to the store and they tested it and it rates at 14.8 volts. So I came back home and rewired the entire thing and still will not charge. Battery is wired to the starter then from the starter to the battery post on the alternator. Then jumped over to the 2 terminal. 1 is then wired to the stater solenoid post that is only hot when cranking.
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post #15 of 18 Old 06-03-2016, 06:03 PM
Spieg8
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Not sure I follow your terminology
Quote:
Originally Posted by Gagewebb View Post
Battery is wired to the starter
Starter or starter relay?
Quote:
Originally Posted by Gagewebb View Post
1 is then wired to the stater solenoid post that is only hot when cranking
Terminal 1 should have power whenever the key is in run , not just when starter is cranking

When I was younger, I thought I was Don Quixote... turns out I'm just another donkey-hootie.
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