Here is a description of the choke system. If the choke is not getting power you need to check the circuit from the alternator to the choke.
On this system, a special tap is provided at the alternator to supply a 7 volt power supply to the electric assist choke. A thermostatic switch within the choke cover closes when the interior of the choke cover reaches modulating temperature. This allows current to flow to the heating element when the circuit is completed through the choke cover ground strap and choke housing to the engine. As the heating element becomes hot, heat is absorbed by an attached metal plate which heats the choke bi-metal coil. When the engine is turned off, the thermostatic switch remains closed until the choke cover interior modulating temperature is reached. If the engine is started immediately after shutdown and before the modulating temperature is reached, current will immediately begin warming up the heating element to open the choke. Once the choke cover interior temperature falls below the modulating temperature, the thermostatic switch opens and current flow to the heating element is shut off. If the engine is restarted at this time, the electric assist function will not operate until choke cover interior reaches its modulating temperature.