1--If you have to, get a pin or other sharp probe, and puncture the insulation on each side of the link. With key in "run" if you only get power on one side,it's bad
2--No. Starter relay is thus:
Largest stud is battery
"square" screw feeds power to solenoid on starter when relay is engaged
one "push on" terminal goes down to neutral safety switch on trans
Remaining push on terminal receives "start" from ignition switch