[T3] Brake Lights

Bryon Garvin spinningrooves at gmail.com
Tue Jul 5 14:38:09 PDT 2011

> It may be the construction. The center hole should be small ALL the
> way thru the small dia part of the switch.

Here's some pictures.


It seems to to *mostly* be the same diameter all the way thru the threads.
 Possibly near the end, it looks to widen out and maybe that's too soon?  I
threw the rest of the switch away days ago so I don't have it to compare
with the threads anymore.  But I can tell you that the switch body had about
a 3/8" hole where these threads would mate up.  So, clearly, it broke at the
point where the hole widened to meet the switch body.

I did notice that once the threads were missing, the diaphragm was easily
seen.  I used a screwdriver to push on it and checked the pins with a
multi-meter.  Part way down, the first contact was made which I assume is
the circuit that would operate the brake warning light.  Pushing further,
the next contact made operated the brake lights.   So it was 2 stages which
I thought was interesting.

BTW, do you need to use a thread sealing compound on these switches?  I have
seen the ones that do have it on there right out of the box.


 - Bryon, '71 Fastback
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