2020 Towing Mirror Backup Light Help Please

Hello all, I have a 2020 Tundra Crewmax Sr5 and I replaced the stock mirrors with some GM style towing mirrors. I was trying to install the reverse spot lights by tapping the wire that comes out of the cargo light relay and goes to the bed cargo light.

My problem is that all the instructions I found show a different ECU harness setup for older third gen tundras under the drivers side front. I am not sure which wire to tap for the cargo lights. Here are pictures of what my ECU looks like and what the back of my Cargo light on off door switch looks like.
Please help me find their right wire to tap!

Thanks in advance for your help!

 

I don't have an exact answer for you but you could try pulling the cargo light and looking at the color of the wires. That would narrow it down a bit

 

I'd try a volt meter at the switch and see which wire gets power when it's switched on.

 

Have my auxillary reverse lamps on their own circuit so I can use them to prepare a trailer, launch or load my boat, etc.