Indeed I have. We recently got a used truck, and the windshield wipers and radio didn't work. After some outside research plus some discussion on Lemmy, I figured out the ignition switch wasn't activating the accessory systems, which require power from the yellow wire.

So, the truck is missing the dome light, but there's 4 wires hanging above the rear view mirror, black, white, orange, and yellow...

I touched the orange to the yellow, and guess what, the radio came to life! So I told my roommate to try the wipers, and sure enough they work too!

We now have a toggle switch for that dangling under the rear view mirror for that.

Thanks again @seathru 👍