I bought this four wire flat wire harness to replace one that has worn out on a trailer. it was easy to connect. I don't think it came with instructions on which cable to connect (I was just paying attention to what was already connected and how), but that's not rocket science to understand. I wish the 12" cable was longer BUT it worked with some extensions but it was an old trailer so the new one will probably fit with the 12" cable.
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