These switches can be used to control 12v 20A max or 24v 10A max DC loads such as lights or pumps by switching the positive DC power supply. You can choose if it will light up the dash or the square when on.
You must connect your load's negative (-) input to the negative (-) battery terminal or negative (-) ground in the vehicle.
You also need to connect the switch's Pin 7 to the negative (-) battery or ground in the vehicle (to power the lights).
Connect the positive (+) from the battery terminal to the centre Pin 2.
Connect the load's positive (+) terminal to Pin 3, and the load will be powered-on when the square LED is lit, and will be off when the dash LED is lit.
OR connect the load's positive (+) input terminal to switch Pin 1 - the load will be powered-off when the switch's square LED is lit, and will run when the dash LED is lit.
Diagram of the pins underneath the switch:
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