Vacuum solved...

["Al Powell" <APOWELL@agcom.tamu.edu>]

Orin Eman kindly said:

(the vacuum port on my brake pedal switch is...)
 
> Cruise control.  The cruise control uses a vacuum actuator for the throttle
> driven by its own pump.  Hitting the brakes releases the vacuum and therefore
> the throttle is closed.  

RIGHT!!  My wife just got home and helped me trace it.  The port 
opens when the brake is pushed, thereby releasing the vacuum which is 
being used to hold the cruise diaphragm in position.  Good call!!

> I think the switch is also for the cruise control
> and signals that the controller should quit trying to maintain speed -
> hence the normally closed contacts. 

In the words of of Tim Allen....hhhUUUUUMMMMMhhhhhh?

> There should be another switch for the brake lights.

??????????????.....Orin - you may just have hit it.  I will dive back 
in there and see.

THANK YOU!!!!
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Al Powell                           Voice:  409/845-2807
107 Reed McDonald Bldg.             Fax:    409/862-1202
College Station, TX 77843           Email:  a-powell1@tamu.edu 
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 who knows how to do it."