Why are there 3 wires instead of 2? Red black and white. Whats the 3rd wire for and which ones are positive and negative?

The lights are configured for two brightness modes. Black is the negative, white I believe is the dimmer of the two brightness, while red the brighter one. This allows them to be used in a manner similar to marker/turn signals or running lights/brake lights.

What size drill bit do i need to install these?

3/4 inch bit but you may want to work up to a 3/4 bit

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OPAP 10pcs 3/4 inch Round Side 3pcs LEDs Marker Trailer Bullet License with Stainless Steel 304 Trim Ring Bezel Amber Light+Clear Lens

Product ID: 557541859

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Description

Specifications

Brand	OPAP
Color	Amber with clear lens
Vehicle Service Type	Bus, Car, SUV, Truck, Trailer
Special Feature	Waterproof
Auto Part Position	Outside
Lens Color	Red
Lens Material	Plastic
Item Dimensions LxWxH	1.1 x 1.1 x 1.02 inches
Manufacturer	OPAP
Item Weight	1 pounds
Product Dimensions	1.1 x 1.1 x 1.02 inches
Manufacturer Part Number	OPAPBD-003A2835Z
Special Features	Waterproof

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