Little red button


New member
United states of america
'69 VW Beetle
There is a little red button on the dash of my '69 VW beetle. I have no idea what it is or what it is for. It has a "B" on it. Any information would be greatly apreciated. Ibwould rather not push it until I find out what it is.
So is it actually a button with a B or maybe a D? So far searching Google I have found a red button with a D is the defrost button. Not found anything with a B on it yet. There is also a red light on the dashboard which is a warning light for cylinder head temp if it exceeds a certain limit.

Are you able to trace the wires to help give you some indication as to the buttons job?

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