SO, what's the correct way to wire the rear fog light inan 86 420sel?
I have the two click switch, but it provides power to all the connectors in the rear wire harness even without it being pulled of two clicks.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

That's because the wire for the rear fog isn't there.

You need to connect two wires to the switch
- a wire to the rear foglight
- a wire to ground so the light in the switch will illuminate

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

Hmmm. i wonder why there is an unused terminal down there?

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual