In case you don't have the harness
I tried to buy the harness when I added controller to my old 3/4 ton...I was amazed at what they wanted for a specially molded piece of plastic with some wires sticking out of it (more money than the controller if I recall correctly)
If you don't have the harness or can't find it, you might want to check with a local auto wrecker. It's common that trucks are built with the prewiring under the dash and the harness in the glove box and no controller ever installed...it will surely be cheaper than from a dealer.
Zeke
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