New radio wiring

I cut the factory harness to wire my dual stereo. Confused about some of the wires from truck.... Do i use factory amp or do i have to bypass

 

Do you have a JBL OEM unit? If not there shouldn't be a factory amp.

 

Isn’t there a small factory amp in the lower dash on non jbl systems?

 

After ten years I can't remember
I used a plug in harness but don't recall any amp on mine.

 

Do you still have the factory plug that you cut off or a picture of it?

 

Trying to wiring up a 2006 Toyota Tundra after market radio. The diagrams that I see here online doesn't match mine. It's a OEM unit not JBL. Where do I find the wiring diagram?