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I am replacing my auxiliary light switch of my car.

on the switch assembly, it has a positive, negative, and ground. I am replacing it with a pololu pushbutton power switch with an oem switch that is a momentary type.

Here is the switch: http://www.pololu.com/product/750/pictures

Positive to Vin Negative to Vout There are 4 grounds on this circuit board, so which one is the correct one to connect to the right ground?

Or am I completely wrong?

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The site you link to shows a picture of the breakout board. The lighter green patches are the copper traces connecting the silver contact pads. You can see that a large trace connects all four Gnd pins together, so you can use any one of them. The same goes for Vin and Vout: each pair of pins is connected together.

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