Auto Choke Operation

[bmetras]

Can the auto choke for these scooters be bench tested? And what should I expect to see. Received a new choke today.. without mounting in the carb. I plugged it into the harness in place of my old one which is installed in the carb. When I started the engine, I see no movement of the needle from the new choke.. I then unplugged it from the harness and hooked an external 12v source to it on the bench .. still no movement.. am I testing incorrectly or did I buy a dud.. thanks for any info..