pull switches for twin plug ignition

[911scfanatic]

Can anyone tell me the applications for which the interior pull switches were used on twin plug set ups? I believe they were used on at least the R and maybe RSR? Anyone know how they were wired and how they were used (e.g., normally in the "out" position and then pushed in to disable the upper and lower ignition)? In the LHD R's, I have seen them located in the same spot--on the far left of the ignition switch. TIA for the info and any pics you can provide.

[911scfanatic]

here are two pics I found off of this website:

[Eric911S]

Hello: The twin plug dash switchs wre also used on the 914-6gt and some 935's. If I can remember correctly the switchs are on when out and off when pushed in. I'll have to check my switchs to see how they operate the cd boxs. The switchs I have are out of the car so I can check them. The hard part is finding them. Thanks Eric

[911scfanatic]

Eric, thank you. I just bought a set that look just like the ones in the top picture (the pulls have a small dimple and a chrome retaining nut with a serated periphery). Don't know if they're "authentic" but they look like they fill the bill anyway. I would appreciate very much any info you could give on how they are hooked up. I will be running two 6-pin CDI boxes to run an SC twin plug conversion from Supertec. I assume that each switch somehow kills the power to each box.

Also, are these two pull switches the only means for cutting power in the cabin, or is there another switch that is used to kill the battery or fuel pump? Finally, I'm assuming that the typical battery kill switch is used on the exterior of the vehicle near the driver side wiper on the cowl? I have already obtained this silver Bosch kill switch that I have also seen mounted in the dash speaker.

I don't need a dash mounted horn switch since I will be running a silver prototipo with an operable horn pad.

[Steve@Rennsport]

Hello: The twin plug dash switchs wre also used on the 914-6gt and some 935's. If I can remember correctly the switchs are on when out and off when pushed in. I'll have to check my switchs to see how they operate the cd boxs. The switchs I have are out of the car so I can check them. The hard part is finding them. Thanks Eric

Eric:

You're right,......I used to race RSR's & 935's that had these and those switches are a plunger type that are open when depressed and closed when pulled.

I have some here and just checked to be sure,...

Carl Thompson used to have them, but he sold his whole inventory (ex-Vasek Polak) to Friesinger Racing in Germany. They will not be cheap anymore.

[911scfanatic]

Anyone find info on how these are wired to the boxes? Thanks.

[Ernie W]

Bill, this link will show a 911R wiring diagram for the 901/22 engine

www.pbase.com/911r/image/24220608/original

[911scfanatic]

Wow, great resource! Thanks!