The switch instructions say it is from Foxton. It attaches to the column with a hose clamp. I tried to upload a picture of the wiring diagram but I'm experiencing some technical issues with the website preventing that at the moment.
I have taken the switch apart and confirmed that there is power to the "brake" wire and contact when the brake pedal is depressed. Internally the brake wire connection makes contact with a metal strip that crosses over to the other side (presumably to contact with the second brake/turn light wire).
I confirmed that if I touch the brake contact with the right rear turn signal wire contact and depress the brake pedal that the light illuminates, but the internal contacts are apparently not functioning as intended.
There are 3 metal contact strips supported by small spings in a plastic case that rotates with the switch lever relative to the fixed plastic plate that has the wires connected to contacts. I presume that in the center position the brake contact is intended to be connected to the left and right rear turn signal wires such that when power is provided through the brake switch that the lights both illuminate. when the switch is moved to the right or left turn position the contact plates connect the switches power source with the corresponding rear turn signal wire through the flasher to illuminate/flash the corresponding rear light. I supect that the other "brake" light would be illuminated even though the contact position is rotated from the center position.
I have tried to clean the contact plates to remove any residue from sitting on a shelf for an unknown amount of time but so far no joy. I have not tried to clean the fixed contacts yet but that is probably the next step.
Assembly of the switch requires some adjustment of the screw that secures the rotating part to the fixed part such that they can rotate relative to each other but still retain contact pressure between the metal strips and the fixed contacts. The springs pushing the plates against the contacts are not very strong and do not have a lot of excess compression to maintain contact between the plates and the fixed contacts.
