What are these parts & how do I test them?

Trying to get my 318 to fire for first time since I bought this Duster. I turn the ignition key and nothing happens. So I'm tracing the ignition, one part at a time, to see where the problem is located. All I know for sure is that the battery is fully charged. I do know that the second picture is the voltage regulator but how would I test it?

Motor is a '70 318 with 3 speed manual. I know the motor is not original and the floor mount shifter is also not original.