12V with a voltage tester is too low. It should be 14V without the truck running
if your dash voltmeter flickers or jumps down and then up, it could be your belt tensioner needs replaced --- easy to do and cheap!
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Originally Posted by Zwoof
my voltmeter (in dash) will be holding steady at 14 then drop to 12ish then it will go back to 14, I drove most of the way home today and it was sitting on the low end...I tested the battery with the engine off and it was 12ish (my meter scale is small and hard to read exactly) With the engine started its reading 14 (even though the in dash volt meter is reading low)
I started it again and this time it was reading 14 again..The batery terminals are clean and tight and the car runs well....Any Ideas? Thanks in advance of any replies
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