Originally Posted by di11igaf
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.