How to install trailer brake controller harness on 2025 Tacoma built without it?

[Poolhobbit]

My 2025 Tacoma was built without the rear trailer wire harness's For (4 pin and 7 pin) the harness's arrived at the dealer and they handed me a box with four separate harness's. No instructions and they refused to install them.

Anybody have instructions on this?

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[Duce95]

Upload some photos of what you bought. Might be able to help if I see what you are working with.