The choke should only supply voltage with the ignition switch on. The choke does not work intermittently, there is a resistor in the electrical box that will cut the voltage to about 9v. This is to slow the rate so that the needle does not block circuit prior to engine being warm. It sounds as if there are some wires crossed if getting power to choke with ignition off. The choke is wired to the accy side of switch.
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