Dear Sirs, I have an old fashioned carburator on my boat and it seems that the choke is not operating. How does an electrical choke operate anyway??? Does the voltage( from primary side of coil) heat the spring element in the choke housing to make it expand and contract??? Or does it do this by turning the spring electrically by change in resistance as the engine warms up?? I am assuming that it knows when to choke or not by getting a voltage from the water temp. sensing unit. What happens to it from the sensing unit out?? There are two wires plugged into the center of the choke housing unit and it has a ground wire connected to one of the screws. Thanks, JoeA.

I noticed on saturday when I had my a/c on that my controls don't work on low or medium they do work on med.high and high this is both with the a/c and the heat is there A wire that could be disconnected for the low and medium or what could this be thanks for any help.