I have an 04 Sequoia and when I bought it the hitch was wired with a harness for the 4 wire trailer plug. 2 of the pins were ripped out by the previous owner. I bought a replacement plug to spice into the damaged harness so I could tow until I got it fixed. When I got under the truck it was very interesting to see how it was connected. The wiring for the 4 wire harness was plugged into a 4 pole plug under the driver side of the vehicle. Right next to that is another 3 pole plug that is capped off and has very heavy gauge wires connected to it. They appear to be about 10 gauge. My assumption is that these two plugs can be connected to a different harness for a factory 7 wire harness and plug. Does anyone know if this is correct? Does anyone have a part number and price for this harness? Thanks in advance.