Disconnect the white wire with black stripe from the reverse light socket. I bundled it and taped it thoroughly in case someone wants to go back to stock or my experiment fails.
The next question was how to get the fog light wire into the light housing. There didn't seem to be an obvious way to join it with the existing wire bundle, so I drilled another small hole, grommeted the wire as best I could with electrical tape, then sealed inside and outside the housing with putty. I crimped (
http://forums.pelicanparts.com/porsche-911-technical-forum/923264-opinions-wire-crimping-vs-soldering-vs-both.html).
I'm pretty sure someone on the board can offer a better solution for protecting that wire, and I'm not against going back in and redoing what I've done if that seems sensible. Suggestions welcome here.
Due to the tail light housing being grounded and therefore only one wire going to the reverse light socket, the ground wire in the fog light harness isn't being used.
Now for the questions
1. Which switch?
A. In a thread about wiring the rear foglight (
http://forums.pelicanparts.com/porsche-911-technical-forum/241146-911-rear-fog-light-wiring.html), Warren posted this wiring diagram, which seems to imply that there's simply a terminal II waiting for the rear foglight wire to be connected and then life is good.Maybe the switch I have will do the job, though I would rather be able to control front and rear independently. Note that I haven't removed my fresh air system to look yet, and won't until I know I have parts on hand, so I don't know what I'll find in there.
B. The PET gives several possibilities for switches. Up to 1980, it gives 914 613 451 10 and 902 613 623 90.
914 613 451 10 is a single-pull switch that looks like this:
902 613 623 90 is no longer available, but the description I've seen is that it's got four connectors also, so is probably much like the 914 switch above.
So it seems like pre-1981, front and rear foglights were either on/off simultaneously or controlled by separate switches. Can anyone confirm this? There is room on the dashboard for another single-pull switch for the rear fog.
C. In many threads on the Forum, Pelicans say that they use the same switch for separate foglight control as for the two-stage window defog (such as here
http://forums.pelicanparts.com/porsche-911-technical-forum/167698-euro-rear-fog-light.html). I have an extra 911 613 145 00, which is the correct pre-1981 switch for the 2-stage defroster. Any idea how to wire it? It's the one on the right, and has 4 pins plus a place for the bulb to go in the center. The pins are labeled 1, 2 (bridged to ground with the green wire), 4 and unlabeled.
D. 911 613 147 00 is listed in the PET as both the 2-stage defogger switch AND the foglight switch for 81 and later. Pelican has it in stock (
1981 Porsche 911 SC Coupe - Switches, Motors, Relays, Fuses & Wiring - Page 7). Any experience on whether this will fit?