If you are not making a pigtail and inserting into each plug, don't push them all in yet, just place them in and double check your pin locations (they are keyed to go in a certain direction:
Next, use a small needed nose and push them in one by one fully by row. They will fully seat, and check the connector face as you can visually see when they have set all the way, secure it with zip ties to the OEM plug.
Run it from the back of the radio through the drivers side of the cab, watch for sharp edges and use other harnesses to secure it along the way, staying clear of accelerator pedal, steering column, etc. I ran it behind the fuse block under the steering wheel and secured it to make sure it's out of the way (driver seat is towards the top of photo):
This is where you can run it through the firewall. This is where the OEM Power Sidesteps also have you feed through the firewall (not the hood release cable spot, you can see that in the bottom right of the picture. That box is actually the power side steps controller.
Another picture, it's more of a rectangle rubber plug with a round on the top, a lot of cab wires run through here
Here is where you'll come into the engine bay. If wiring it all in now, leave a short drip loop (section of cable that hangs down below the exit here).
I left mine bundled here for now while I make my fuse/relay box. If you are running it, pull the front driver plastic fender well and run the cables there behind the battery box if you are running it to the front of the engine bay. Look at the OEM powered side step instructions on this, they describe it well how to do this.
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