Sound like you need a wiring diagram and/or a multimeter

 

Standard convention is that black is the ground wire. You'll need to check the others.

The problem you are likely to face is that a 2016 bike will be Canbus electrics, which does not take kindly to having extra things spliced in like this. I'm new to Triumph so this might need confirmation from somebody familiar with the brand. The canbus system is constantly checking the operation of each component and if it finds a voltage drop it doesn't expect it throws a code. If you are wanting to add extra lights then chase up with the supplier that they can be fitted to a canbus bike without this problem.

 

I'll review the board to see if canbus wire splicing is an issue, thanks.

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So I found this in another thread...

Yellow is the running light (hot when the key is on).
Green/Violet is the brake light (hot when the brakes are applied).
Black is ground.

...
And after further evaluation I have those color wires. Looks like I will attempt to splice the green/violet wire just before the quick connection to the brake light.

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I know this was a couple years ago but I was curious if you were able to hook up the lights and if they ever through any codes?

 

I spliced using Posi-Taps into the brake and turn signal wiring when adding LEDs with no adverse effect. Canbus is not an issue on the 2016 Tiger. I was initially concerned that adding the LEDs would tax the circuit and blow a fuse but the draw is so low that there was no discernable effect.