Ok. I just know on commercial vehicles that I do DOT inspections on that only red can be used on the rear for tail and stop. You can have an amber turn signal, but it cannot be lit as a tail light. Drivers will take the red turn signal/tail light assembly out and put an amber one in without cutting the black (or brown) wire to the lamp and then it will light as a taillight. DOT officers will cite them for this. I know this is a federal thing, since it is commercial vehicles, so I'm not sure how it goes for non-com vehicles per state.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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