The most senseless thing I've ever encountered was the headlight/wiper door Actuation system on my '72 Vette.

What isn't shown is the electrical part of the system. The headlight switch is electric. That triggers the vacuum switch that starts all the switches, relays and vacuum motors.
Same with the wiper door, but...................there is another electrical/ mechanical switch on the firewall that must be closed by the door opening mechanism before the electric wipers are powered up.
It's a nightmare to trouble shoot and maintain.
There's more.
What's yours?
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