[Buzzmobile]

I am trying to sort out a brake light problem and any help is thanked. I have a SPF car and I think the switch everyone talks about is the culprit. But, I think someone has altered the original wiring and I am a bit baffled. I will try and describe what I have and hopefully attach a pic that can be seen???? first time with pics. I have a 2 pronged sensor (I think the "switch") screwed into the master cylinder. One wire obviously grounded to the MC housing and the 2nd wire going over to what looks like a relay. The relay is attached to the wires that are attributed to the brake circuit by the diagram provided by SPF, but the relay itself is not listed in any of the wiring diagrams. My question, is it the relay or the switch. Does anyone else have this relay? Anyway, thanks for any input.