1994.5 - 1997 7.3L Power Stroke Diesel  

Alternator only working sometimes????

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  #1  
Old 12-22-2015, 05:41 PM
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Alternator only working sometimes????

The other morning I started my pickup to go to work and when I came back outside it was off. I jumped it. Watched the volt meter and it was charging. When I got to work I turned it off and I started it right back up to check if the battery's were good.

This has happened a couple times. And I just happened to have a spare set of battery's lying around. Put them in and nothing. Took the alternator out and had autozone test it twice. Passed both times. Took it to orilieys and made them test it twice also. Passed both times there too.

Some times when I'm drive I can see it not charging then the radio will die then the speedo goes out.

Today when I got home it died on me and I put a volt meter on both battery's. One was at 12 and the other was at 11.9.

Anyone have any ideas?
 
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Old 12-22-2015, 05:46 PM
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Check the three wires that plug in the top of the alternator. Make sure none are broken, and the plugs are getting good connection.
 
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Old 12-23-2015, 11:36 AM
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The wiring and connectors all look good. Idk if it means anything but the battery light used to come in and go away all the time. Hasn't done that for a couple months though.
 
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Old 12-23-2015, 12:17 PM
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It also seams like if I put a batter charger on it while it's running it like jump starts the alternator. Because after I ever time I do the alternator will work until I **** the truck off.
 
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Old 12-23-2015, 04:01 PM
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What's your voltage out of the alternator?

A lot of times that single wire connection causes the alt light to come on.
 
  #6  
Old 12-23-2015, 05:28 PM
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Originally Posted by bubba_3711
I **** the truck.
what are you doing to your poor truck?
 
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