I'm trying to wire few accessories in and need a little help in finding the correct wires.

1. I've got a PIAA set of reverse lights that have a switch that lets you have them operate with the reverse lights, off or on. I needed to tap into the reverse light wire. Wires from relays run in through drivers side firewall

2. I've got bed lights and ran the wires into the drivers kick panel what wire can I tap to operate with the dome or cargo light?

3. Tailgate lock, wanted to verify wire colors? I've found to gray/purple wires one thick and the other skinny, again on drivers side as wires run from relay through drivers side firewall?

Just spent two hours in the online wiring diagrams from Ford I'm lost.

Thanks all!

 

Here's what I think.

Blue-white

Purple

Skinny purple-gray and skinny gray-brown