Do you have the two wire can or the three wire can. If three wire, power to it he interior lamps is provided by pin "P" on the can.
I just checked your switch part number and it does require the three prong can. You are using the three prong can, correct?
In the last several months I purchased two new 6 volt positive ground flasher cans. One didn't work. Found out the diode was installed backward.

Last edited by beltfed; 02/08/2017 12:29 PM.

Six volt guy living in a twelve volt world