I was in the same boat as you (new to diagnosing these problems). Grumpy was an invaluable help, so I'll copy/paste his advice to me for how to test the voltages:

"Use a DMM to test the DC outputs. Set DMM to DC 200 volts and stick black lead under the ground braid and use the red lead for testing."

I've put red boxes around the test points. Test point 1(TP1) is in the top box, and test points 2-4 are in the bottom box. The orange box has the two connectors to leave connected. I'm not sure which fuse is which, but you may have a fuse chart in the head that will show you which fuses are F2, F3, and F4.

Good luck!

F14 Power Board-edit (resized).jpg

Thanks! The boxes are pretty simple. You can even do them using Microsoft Paint.