"Jay Honeck" wrote in message news:ePArc.38163$gr.3760706@attbi_s52...
ASCII schematic:


Why is this circuit set up to do this?

If the long piece of wire from the solenoid to the master switch
should happen to short to ground anywhere, it would keep the solenoid
activated, instead of blowing fuses as it would if you were switching
the +12. It was the safest, most reliable design at a time when
today's clocks were unheard of.
--
Gene Seibel
Hangar 131 - http://pad39a.com/gene/plane.html
Because I fly, I envy no one.