Charging issues

Dana67Dart said

What makes you think you have a charging problem?

If the alternator indicator is bouncing around or showing discharge at idle the alternator might just have a pully that us too large. I went from the rebuilders favorite about 2.75 inch dia to the stock about 2.5 and the guage is calm now.

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I am pretty sure I have a charging problem because it just seems to run off the battery till it dies. Everything is new in the engine compartment even the wiring harnesses , when I start it and check it with a meter it reads the exact same as when I test just the battery without it running . This has me going nuts !!!