• NEGATIVE SWITCH is switching the - (minus), LED inside is connected reversed to light, when the contacts of the switch are connected to minus and the 3rd pin to + (positive)
• All the switches have 3 terminals, the bronze colour connects the internal light
• Panel mount diameter: 20mm
• Overall dimensions: 30 x 23mm (Height x Diameter)
• Switch Rating: 20A 12V DC
• Light Rating: 5-16V DC
• Unfortunately these will work with 5-16V only, otherwise light will burn-up

How to connect? 

• Check the second picture for Positive Switch (Default) and 3rd picture if you want Negative Switch (Available in Blue only)
• Basically the "silver" pins are the contactor (positive (+) wire) and the brass pin goes to minus (-) to supply the internal light with power, when contactor is switched