Hi All -
I am going to use a 911 heated window switch to control the fan on my oil cooler. I am trying to verify the different tabs on the back of the switch.

Here is a diagram of the back:

Click to view attachment

I am guessing that the numerical definitions are standard for all porsche switches - but I dont want to burn up the switch or wiring by making this assumption.

Here is how I think things should go:

31 = Ground

58 = light inside the switch <-- is this + or - ?

15 = keyed power

I = Load/Accessory #1

III = Load/Accesory #2

Can anyone verify?

Also, is #58 a positive or negative lead? When installing a standard off the shelf FLAPS rocker switch, the lead to make it illuminate is negative. However, those types of switches do not have a ground - they just interrupt the power lead to the accessory.

On a side note, this is a single postion pull switch - weird that is has what appears to be two load "outputs".

Thanks a million for any help!!

Scott S

Get yourself a cheap digital multi meter (under 8$ at harbor Freight)
then using ohms scales, check across various terminals switch off & on.
If open switch closed and zero or just a few ohms switch on you'll know.

Barefoot

If this were my project, I'd put a temperature switch in the oil line and activate the fan through a relay. Simple, effective, and it doesn't rely on the driver (who may have other things to do besides watching the temp gauge) to switch it on.

The Cap'n