I recommend Vince's material. I had a high current draw (420 amps) on a truck starter and was able to troubleshoot it using V.E.T. SHORTCUTS. My problem turned out to be mechanical-a cylinder full of liquid, which does not compress!

I can't say enough good things about Section 4 of your SHORTCUTS. It is excellent. Compared with what I know now about vehicle batteries from just one reading of Section 4 I knew basically nothing before!

Bought the SHORTCUTS book several years ago and it (is) an immense help to my diagnostics abilities . The YouTube videos are excellent help as well. I recommend both to anyone in the automotive field.

God bless.