I finished wiring the rear marker lights (old A3 brackets, new paint and lights) to the "21" circuit (look for the wire end on the tail light/rear harness with the little metal tag crimped to the wire with a "21" stamped in it - probably will be covered in dirt and paint like mine was). The red marker lights come on when ever the tail lights are on, but do not flash with the turn signal/4-way, and of course, don't get brighter when the brakes are applied.
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I also connected the reverse lights to a 'Y' splitter in preparation for a line run to a switch in the cab. Modifying that shaft on the transmission for automatic reverse lights is too much for me right now, so a manual switch it is! I'm still a bit crazy though, did go to the trouble of undoing a couple bolts on the rear wire harness right beside the pintle so I could route the new reverse light wire through the same hold-down points. The 'Y' splitter is on the driver's side so I can follow the harness forward.
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