[mjw357]

Originally Posted by jsnbrd

I took a picture of the relay compartment, the manufacturer 7-way wiring at the rear and a splice wire that was used from the tail lights for clarity, for me. I have one small 10 Amp fuse on the right and this relay. Do I need to fill the other two relay locations in order that the 7-way wiring will all work?

Yes you need one brown and one blue relay in those two positions. Buy it here from U_Haul instead of the dealer. U-Haul wants $20-$25 for a set of three (2 blue 1 brown), dealer will get double-triple that.

Originally Posted by jsnbrd

Should anyone know what the colored insulation signifies, i.e. aux, or brake, or left turn, etc... please post that info as well, thanks.

My trailer connectors are all up inside the fender, so I can't just look or take a picture. I think this is correct for the truck wiring colors.



The colors for the wires for the connector you buy will vary by brand. For Hoppy (Hopkins Mfg.) take a look at this.

Of course it would help to test each wire as you connect it up to plug, a 12v test light is good for this.

Good luck.