Soldering iron
Shrink tubing

Reach under seat and swing out the plug holder.

Pull centre plug away from plug holder and separate the plug.

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Cut the wires going to the seat. (the red, white, brown wires)

Solder the Red to red (+ve), Blue to white (Signal), Black to brown (-ve)

Remember to fit shrink wrap before you solder.

Shrink the tubing.

Plug together and fit to holder. Swing back into place.