my Puch Dart headlight and tail light aren't working. I have tried bypassing the switch, removing the regulator, and have all new bulbs including speedo. I am getting less than 1 volt coming into the terminal block from the magnetto on the yellow wire. Ohm reading yellow wire to ground is 0.4. Manual says it should be 2.0. I replaced the coil with a new one and get the same readings. Everything else on the bike works fine, horn circuit, brake lights, ignition. Any ideas what to look at next? Everything relative to the wiring diagram appears the same.