I have just fitted a New electric choke to my Rochester q jet as the hot air choke would not work with the intake I have. I am a bit confused as when the 12v is applied ( I got this from the wiper motor feed ) The metal coil in the choke housing contracts as it gets hot in affect pulling the choke on. I understand that it is supposed to expand pulling the choke off as it gets warm. Have done something wrong? Thanks