OK so they cut the wires. (dicks) Do as Chris.O said and get a 12 volt test light. You needn't go crazy finding a wire, as he said there are several terminals on the fuse box that are switched 12v ignition. Just run a new wire and ground the other. The Q-jet electric choke has no gasket between the choke housing and carb so it grounds through the carb body. Yours wants a dedicated ground so just run a wire to the motor somewhere.