Charging problems 67 Barracuda

I have a GB Instruments GMT-18A multi-function instrument. It's more of a household item but it's worked on the limited automotive applications for which I've used it. Seems to work OK.

OK, simple, old school meter. Simply set the selector to OHMS X1 down at far right (not X1K), and hold the probes VERY tightly together. Carefully set the red knob to "0" ohms. In the Navy, our meters were supposed to be calibrated (we were told) lying flat on their back. Maintain the same position you zero the meter in. Be careful of meter face static, which can throw things off. Often, "fogging" the meter with your breath will drain it off

You are only looking for a difference of a couple of meter scale marks between 0 and whatever the field might be so be careful with the reading