[goldgunner]

I'm stymied and need help!

Rear Defogger switch, 2 stage (911.613.145.00)
Has 4 terminals, numbered on the switch as:
1, 2, 3 and 4.

# 3 is clearly ground (brown wire) - since it also runs to the outside of the bulb lamp
# 1 would be positive (black wire), I'm pretty sure

Here's how continuity checks:
A. Switch push in all the way ('Off'): No continuity between any terminals
B. Switch pulled out 1 notch: Continuity # 1 to # 2 (only)
C. Switch pulled out 2 notches: Continuity # 1 to # 4 AND # 1 to # 3

For this 1980, looking at wiring diagrams from both Bentley and the Porsche shop manuals, I can't determine the connections for the other 2 terminals on the switch.

The wiring diagrams show 'Terminal 58' getting a Black/Blue wire (for "Interior Lights") and the 'other' terminal getting a Grey/Green wire (from the electric mirror harness), with a Black wire attachment (to the Rear Window Defogger RELAY).

Is 'Terminal 58' the switch terminal # 2 or # 4?

Seems to me like the switch lamp ought to be 'on' whether the 1st or 2nd stage (notch) of the switch is on - but according to the continuity - it's only on for the 2nd stage.

Yea, this is a long way around asking how to wire this switch in...

Hoping for help,
thanks,
Jim