Jerry Eichenberger is an actively practicing aviation attorney in Columbus, OH since 1975. He is also an FBO owner, commercial pilot rated for single- and multi-engine airplanes, helicopters and gliders, and is a CFII and multi-engine rated flight instructor.
To troubleshoot your system and wring out some wires, you will need to find a good way to make contact between the multimeter test leads and connector contacts.