Thumbs up!

I found this simple diagram for the switch that confirms the switch is normally closed and uses a path with a resisitor when open.Does this connector look like the spot where the resistor would plug in? Also note this bike does have a battery compartment. Thanks in advance!

Hi Lorenzo, As I understand it AC is Alternating Current and DC is Direct Current.Yesterday I used an ohm meter and applied it to the yellow wire from the engine case and got current to the green wire at the taillight,then I connected the two wires at the brake light switch I got power at the black wire and green wire at the brake light. In my mind that tells me the tail light is on when the engine is running and the brake light is on also when the brake light switch is in the closed position (pin compressed and brake pedal not being applied). The tail lamp has been modified at some point and had a single filament bulb and socket in it,would this not supposed to be a dual filament bulb and socket originally?

Thanks for the replies Guy's, I will have to find a image of the wiring diagram to wrap my head around this type of system. Lorenzo, does this switch look like it is an original OE switch that Bultaco would have used or a replacement,the switch had no continuity but after using some electrical spray cleaner it is working again.

Hey Guy's,I have a 138 I have been sorting out and I am not sure if I have the correct brake light switch? When I apply the brake pedal it extends the switch pin and opens the circuit so when your foot it not on the brake pedal the switch is compressed and the circuit is closed,does that make sense?