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A lot of the turn signal / brake light stuff is handled by the turn signal & flasher switch assembly on the steering column I’d just remove the existing wires from the break pedal switch and run a new wire feeding the brake light switch on the brake pedal and run it with a new wire back to the stock brake lights Then move the turn signal wire from the current light to the new amber light This would remove the turn signal from the brake light circuit totally You in OZ or UK or a place that requires amber signals ?Depending on your local requirements for area size of the signal lenses , there are lots of thin LED lights than could be mounted on top of the bumper Plenty of motorcycle turn signals etc
Just curious if any of you have ever installed a trailer wiring harness? Now think about how that works