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Old 08-06-2014, 14:15   #18
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Z71bill's Avatar
Join Date: Feb 2007
Location: Texas
Posts: 12,801
Originally Posted by di11igaf View Post
You should read around 14.2 volts or so while the truck is running with a good alternator. See what it reads, bet its in the 12 volt range, which would indicate a bad alternator.
Thanks - good idea - I will use this in the future - can't believe I didn't already know this simple test.

I just tested it with my free Harbor Freight multimeter.

12.7 volts with engine off

14.3 volts with engine running

I feel more sure than ever it was just a bad battery -

If driving 10 miles 45 -50 MPH - doesn't put enough of a charge in a battery for it to even turn over the engine once -

It seems like battery is the problem.
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