what does this yellow button do?('72 e3)

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Buffarea

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This button is not for the rear defrost (thats on the other side of the wheel). It pushes in and I can hear a click sometimes when I do so, but it does not stay in (like the defrost button)
So, please-What is it?
http://
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By the way, this pic was taken before I removed the other 2 non-oem buttons and repaired the vynil.
 
Red, Yellow & Green

Believe the three factory buttons were designed as follows:

Red=4 way emergency flasher
Yellow=rear window defrost
Green=switch for rear fog clearance light

Theory--perhaps someone substituted the yellow button--they screw on and off--for the rear fog light, therefore unlike the defroster button it doesn't stay in when pushed and instead clicks.....
 
Rear Fog Light

The wiring is in place even if the light is not. Part of the original harness I think...
DSCN2320.jpg

Stan
 
What button?

North American spec model E-9's were not equipped with fog clearance lights--though for many areas--think Central Valley of California and the coastal areas both South and North would have made a lot of sense. We were well behind the safer lighting requirements that were a standard in Europe. Our Department of Transportation was protecting the financial interests of Sylvania and GE. Think our wimpy sealed beam headlights versus halogen--the Euro standard then--and still fine for most conditions.

While a large number of Euro spec cars were fitted with fog clearance lights--according to requirements for same as specified by many of the countries to which they were scheduled for delivery.

Yes--there is provision in the standard wiring that came with both NA and Euro spec E-9's. In the absence of the trim piece between tail-lights that had a built in space provided for a light--some owners have purchased a light that was available for the early Porsche. I have one installed on my 2002 located below the rear bumper. I bought it from Mesa Performance several years ago. Whenever my headlights are on--it's also on--kind of a warning--"stay back from my rear end"--as the light is about 10X the intensity of regular taillights
 
Very informative! Next I guess I start looking for unused wires near theleft tailight, and then for a vintage euro tail light to mount.

Thanks all!
 
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