SharkSkin

I've been eyeballing circuit diagrams a bit more than is healthy over the last few days. I finally got around to digging into my pod, and along the way I found that there is an unused contact on my combo switch.

It makes contact when pulling the turn stalk to the rear. As best I can tell from the diagrams, it seems that this function should illuminate euro driving lights while the stalk is pulled -- as in "flash the left-lane hog". Hard to be 100% sure, as the wires on the diagram go off into la-la land after the switch -- no explanation, they just end at M7 & M8. I only arrived at my conclusion above because they pass through fuse#2, which 928 Specialist's charts show as euro driving lights.

So, the question is, can anyone confirm that this is the way it should operate? If anything happens(day or night) when you pull back on that lever, what are your observations? Please state MY and US/Euro/ROW.

Thanks!

FlyingDog

Flashes the driving lights when the headlights are down and flashes driving and high beams when headlights are up on my 84 Euro.

SharkSkin

Cool... do you happen to have a Euro wiring diagram that shows this?

FlyingDog

Page 97-199 of the WSM (Model 84 page 2 passenger compartment and instruments) shows it.

56b on the first pic connects to the dashed line going to 30 on the second pic. I didn't look up what M124 is which determines whether the solid or dashed line is connected to 30 on the front foglamp switch.

Chuck Schreiber

Sharkskin,

This came straight from the copy of Up-Fixin Der Porsche I have sitting here in front of me (Volume 5) Article is dated 7/78. This is designed to activate in bumper fog light flasher via pull back on stalk.

1. obtain diode #5059 905 371 from any Porsche dealer

2. Loosen and lift up the instrument clster and cover to gain access to the back of the dimmer switch

3. Uncover the fuse panel.

4. Install a new (#16) wire (about 6 feet long) onto vacant terminal #56A (clearly identified) on the back of the switch. String the other end through the back of the dashboard, and under the carpet down to the right foot well fuse panel area

5. Trim the new wire to a convenient length, and connect it to the female end of the diode. Connect the remaining length of wire into the male end of the diode; piggyback the other end onto the existing black with pink dots wire, which is connected to terminal E1 on the fuse panel

6. Check operation and reinstall dash and floor coverings.

7. Have Sharkskin do a complete writeup with pics and instructions the rest of us dumbarsses can understand!!!!

Hope this helps man!! Again, write it up so we can understand with plenty o' Pics!

SharkSkin

Great info, guys! I don't see how to make it flash the high beams when the headlights are on, but if I've got a real annoying left lane hog I guess I could just cycle the switch fore & aft for that "disco" effect. Now, the next question -- anyone know where to source that odd round connector (larger of the two sizes) that connects to the combo switch?

Geez, I've got to get going on site updates -- I'm behind a few writeups already!

SharkSkin

OK, knucklehead move here... I didn't measure the terminals on the back of the combo switch before reassembling everything. Does someone have a loose switch they can measure? I need the diameter of the large size terminals on the back, 56a for example.

I'm trying to determine whether P/N 3-4708 at EagleDay is going to be the right connector.

Also, after perusing the wiring diagrams a bit more it seems that doing something with terminal B2 will get my high beams to flash if the headlights are on. If I read the diagram correctly, I will have to interrupt power to B2 to do this. I could be wrong, and find that I need to apply 12V to B2 to get the high beams to come on. The latter is easy, just need some isolation diodes; the former will call for a relay.

If anyone knows offhand whether P/N 30-296 here is the correct replacement for terminals such as B2, E1, etc. please let me know -- that would be very helpful. I have a spare panel I can scrounge connectors off of, but new would be easier to work with. I'm going to do this without any alteration of existing wiring. I want to make it so with my notes, any future owner can understand the change and revert it to virtually "untouched" condition in a minute or two.

SharkSkin

OK, I think I know what terminal to get now. Tom at 928Int'l was nice enough to measure the terminal for me one a unit he had on the shelf, confirming it's 3.5mm. I just came back in from a spelunking trip through my wiring -- I verified the switched 12V at the 56a terminal, and I've identified where to tie in to get the foglights to flash any time the stalk is pulled and how to get the high beams to flash as well if the headlights happen to be on. This will call for a relay, but I think it's the extra touch that will really make the job worth doing.

heinrich

Dave sorry I meant to reply a couple of days ago ... pulling causes the driving lights to flash...

SharkSkin

Uh-oh, not another "carpet" thread... Are you referring to your US S4, or other car(s)? Also, do the high beams flash if the headlights are on?

heinrich

Dave my reply to your question on another post was swallowed into the great unknown .... Lights-on, pulling only gives high beams. Lights off, pulling causes the drivers to flash. Fogs and headlights on, flashes fogs off and drivers on with high beam. Fogs only on flashes fogs off only.

heinrich

MY 85

SharkSkin

Thanks H... It's beginning to sound like I'm gonna like my mod better than what Porsche offered on the later cars. The only thing that's maybe a tad inferior is that with fogs only on, pulling the stalk will do nothing. That's OK, for the other 99.9% of the time I will be happy with the behavior.

heinrich

Weird that they left it empty like that ... nice work

SharkSkin

Even weirder that they seem to have had thoughts about doing something or other with the switch. There is mention of it in the owners manual, but from the writing it seems the author was unclear about it.

In any case, I have connectors and wire on order from EagleDay. I need to find a local source for such wire, I wasn't reading closely enough and missed the fact that it takes them 5-7 days to ship the wire -- turns out it's because they don't stock it. I have the relay ready to go, and picked up some ring terminals for the ground. I'll probably end up doing this some night next week.