Agreed, it doesn’t make sense.
There must be 12v in one of the wires to light the brake light filament. If that wire is switched with the tail light wire the tail light should be lit. That’s assuming that you have twin filament bulbs fitted correctly.
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Ian.
Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.
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