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Old 11-09-2013, 06:26 AM
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Alternator issue?

A week ago I had my tensioner explode, threw the belt 1/2 mile from home, made it home, repaired the truck, and noticed afterwards the voltage would drop to 12.5 on my scan guage while running, started checking into it and found one battery at 11.6 static and 8.7 under load passenger side, driver was 12.5 and 11.7 while cranking, placed battery in question on the charger and retested, 12.2 static and 10.8 cranking, took the truck down to autozone this am and had them test the alt came back bad diode, the guy doing the test didn't seem to know what he was doing IMO I explained to him twice that the truck needed to run for a min or so to shut the GP off, each time he tested right away. Don't want to spend 200 bucks if I don't have to, any recommendations would be good, while driving on the scan gauge the voltage runs from 13-14v, occasionally drops to 12.5 at idle but right back to 13-14 while driving
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Old 11-09-2013, 08:46 AM
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Anyone? I don't want to continue driving it and potentially burn up a ficm or something else
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Old 11-09-2013, 09:01 AM
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I had the same issue with the parts store here. They couldn't understand that you have to wait. I ended up pulling my alternator and having them bench check it. When it tested bad then I believed them.

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Old 11-09-2013, 09:49 AM
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Thats kinda why I always take my alt's and starters to a rebuilers shop. They have better test equipment and knowledge than at most retail stores like AZ or even oreilly.
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Old 11-10-2013, 05:23 PM
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took it in this am and had them test it, only put out 8.3v on their tester, put in a new one to compare 15.4v, took it home and installed on the truck 14.2 all day long
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