If you have a circuit, the 9v battery connected to the wire, then the other side of the battery to ground, and you're checking the BAT red wire, yes. THe IGN wire will have 9v with the key on, and the SOL wire (purple 10 ga) when the key is turned to START.
Is the harness in the car or on the bench? I'm guessing you have it installed and trying to make sure you don't have a short somewhere.
Including the year would help, I'm not picking, just your information is a bit hazy,