![]() both tests indicate something amiss upstream. Easy way to do this is to connect the earth connector to the white wire and run a test lead from the +battery and apply to the red and black wire one at a time. I can't read anywhere where you mention this. Have you bench tested the LED? Would be good to know that the tail light does actually light up when 12V is applied. A critical point is where it passes by the rear shockie bolt. They are cabled together from the BMU back along the R/H side of the frame just below the seat. That will tell you if the wire is shorting to the brake light wire. with the brake off, measure the resistance from the tail light connector to the brake light connector. Robmack already detailed this test, but running the park light wire to the rear as you did, does not conclusively rule out an earth short. That will tell you if the tail light wire is shorting to earth. with the fuse-to-tail wire still isolated, measure the resistance from the tail light connector to the negative terminal on the battery. With the fuse inplace, stick your DMM probes into the 2 tiny square holes just above the fuse. This is a known problem with other issues. It could more likely be corroded fuse/holder contacts. You need to measure the resistance on that to be sure. I'm assuming you soldered the jumper wires? Could be a dry solder. A good reading will be around 0.5Ω, otherwise. ![]()
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