Fog light switch wiring question?

[briwayjones]

I have a wiring diagram for a switch that has three prongs. I'm going to use the factory switch which has four prongs. Does anyone have a diagram or know what each prong is? Or have any suggestions on how to wire it up?

 

[Bill Kemp]

I can tell you where they go but not which is which. 1. ground. 2. to relay 3. from power source 4. instrument lighting.
With a volt/OHM meter you could find out 3 & 2 & 1.
Not much help but its the best I got.....

 

[briwayjones]

Thanks that's a start. What does the instrument lighting one do?

 

[Nitrous SSC]

It is hooked up with the dash lights/dimmer.

 

[briwayjones]

Ok that's kind of what I thought. The 3 prong I have is a lighted switch so I was a little confused why the factory switch would have another prong for the light. I guess because it also gets hooked up to the dimmer?