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  #1  
Old 08-12-2014, 12:01 PM
Alexm0711 Alexm0711 is offline
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Exclamation Voltage - Bad reading - Help?

Long story short, Alternator was bad, got another one. 1 day later, my voltage meter on dash drops to 9-10v everytime I start to drive. If I stop it goes back up to 12v+. Went to Autozone, they did the charging system check while truck was on/off/revving/alleletricon/ect. Told me battery was good, alternator was not producing sufficient amps while engine was revved. Nothing I did'nt already know. Now... is this alternator bad.... or is there something else. Its now 4 days old.

Battery terminals - New ( No corrosion )
Alternator - New (Tested for low amps While engine was revved ; Driving )
Battery - Fairly New (Tested Good)


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  #2  
Old 08-12-2014, 01:25 PM
casey.mikl casey.mikl is offline
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Default

Sounds like a bad alternator. Return it and get a new one. Next time you get one get one with a lifetime warrenty.
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  #3  
Old 08-12-2014, 03:40 PM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: Voltage - Bad reading - Help?

Quote:
Originally Posted by Alexm0711 View Post
............... Went to Autozone, they did the charging system check ...................Told me battery was good, alternator was not producing sufficient amps while engine was revved. ......................

Gottcha......

Quote:
Originally Posted by Alexm0711 View Post
..................... Nothing I did'nt already know......................

well then, and since you already know the answer.............



Quote:
Originally Posted by Alexm0711 View Post
............ Now... is this alternator bad.... .


Looks like the answer was known before even posting.



Thus, time to use the warranty on that new/rebuilt alt you installed...... Capiche?
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Old 08-13-2014, 12:02 AM
Alexm0711 Alexm0711 is offline
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Default Re: Voltage - Bad reading - Help?

I knew that the alternator was not putting enuff juice out, casuing the gauge to jump from 9v-12v, Im just looking to see if there is anything else, dont comment if your gonna be a smart ass. It has a one year warranty... like I said I got it four days ago...
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Old 08-13-2014, 03:14 AM
dfpgnm dfpgnm is offline
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Default Re: Voltage - Bad reading - Help?

Getting a bad alternator is not unheard of. I would swap it out with the new one the store owes you from the warranty. But 2 bad alternators in a row would have me checking belt tension, specifically if the tensioner was functioning correctly or if the belt had stretched. Replace the belt when you do the alternator. And check for the spring tension on the tensioner when you do it. It should take a few lb/ft to move it and a bit of effort to hold it, but I don't have specific numbers.
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Old 08-13-2014, 09:52 AM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: Voltage - Bad reading - Help?

Quote:
Originally Posted by Alexm0711 View Post
I knew that the alternator was not putting enuff juice out, casuing the gauge to jump from 9v-12v, Im just looking to see if there is anything else, dont comment if your gonna be a smart ass. It has a one year warranty... like I said I got it four days ago...
Reinforcing a guys obvious conclusion isn't a smart ass comment, lol. You ask a ?, you get an answer, very simple. It's a forum, not a day care center.
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Old 08-14-2014, 03:20 AM
Alexm0711 Alexm0711 is offline
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Default Re: Voltage - Bad reading - Help?

Just gonna go return it get another one, belt is new, Auto-tension is still in good shape.

And cowboy, I ask a simple question. If I knew the answer I wouldnt have took the time to ask. I wanted others opinions on my situation, not for you to waste my time like a 12yr old little girl.
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Old 08-15-2014, 09:57 AM
sheltonfilms sheltonfilms is offline
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Default Re: Voltage - Bad reading - Help?

Yes, usually a drop in voltage at a higher rpm means bad brush contact (bad alternator).
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  #9  
Old 08-16-2014, 06:43 AM
Alexm0711 Alexm0711 is offline
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Default Re: Voltage - Bad reading - Help?

Ya returned the alt for another one. Problem solved.
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