I'm planning to install an amp and a 10" in the back of my 04 F-150 Supercrew. I planned on using the speaker level input and splice the wires going to the rear, driver-side door. I'm having trouble locating the speaker wires, though. Does anyone have any suggestions on how to get the panels off or what color the wires are. I planned on putting the splice in the wire tray running at the base of the doors.

 

Rear divers side door speakers wire colors are:
Brown/Yellow (-)
Light Gray/Light Blue (+)

I like I remember the speakers wires were the only ones that were twisted with each other. All of the others (none speakers wires) were not.
If I remember right the speakers wires going to that door goes up the center post between both doors. Look for those speakers wires in the front door tray. I don't think they go past that center post.

Good Luck!

 

I think those colors are for the motor of the power window...ZAP!!! I cut into the grooming and the only twisted pair were Green-Black and White. There are 4 more that are thicker. I assume they are for the Window Motor and the lock motor. Any suggestions?

 

The left rear speaker, at least coming out of the head unit, is pos is GY/LB and neg is TN/YE

 

OK. I just confirmed that the Green-Black and White are the speaker wires that are going through the side pillar and into the speaker. I took of the door panel using this link (https://www.f150online.com/galleries...w.cfm?num=4897)and took the speaker out. Ford has installed a small harness at the base of the pillar that changes the color of the wire. The Gray/Light Blue and the Tan/Yellow does run through the wire tray beside the base of the drivers door. They are at the bottom of the wire cluster!

 

Guess it would make it just too damn easy to have the same colors all the way!

 

Been awhile since I did mine. By all means go with the colors above.
Thanks, xe279