Ok - I picked up a 73 Trail 70 about a month ago. It was complete and running/functional but I knew I was going to need to do some work. It has a non-OEM carb on it that is larger than stock. It has a larger diameter air inlet and a larger throttle valve. I did a full clean rebuild of the carb and it has been idling and running fine. Which it wouldn't do when I got it. The bigger issue and incredibly frustrating has been the electrical. It came with a 6v battery (dead and dry) and rear turn signals. No electrics were working when I got it. The horn wires were cut and the taillight ground was also. At first I didn't realize it didn't need the battery to start so I thought I had loose/broken connections but then realized it doesn't use the battery to start and the battery was in fact dead. Bought a new battery and fixed the broken horn/taillight wires. Then the horn and tail/brake lights were working. Still no headlight or turn signals. Wanting to get this fully functional, I sourced a new headlight (the sealed 6v I assumed was burnt), turn signal flasher and wiring, front TS stalks and blinkers. Plugged everything in and still no go. I have the wiring diagrams and have traced them to confirm they are connected correctly. The wiring harness has a lot of black electrical tape wrapped around it so I thought maybe there's a hidden faulty splice. Bought a new K3 harness (which has the exact same wires/colors as the existing one but no black electrical tape) and installed it. Still no love. I have tested the ignition switch and it appears to be getting current at the right places/right times. In the off position, no voltage. In Pos 1, 4.57 voltage at Bat1/Bat2 to E (Ground), In Pos 2, 4.57 voltage at HL/TL to E. It appears that power is getting to the ignition switch. I noticed that my stator wiring had 4 wires connected and all went to the stator coils (no neutral switch wire). They were cloth covered (Black, Green, White (maybe yellow), Red). In researching, it appears this stator plate is for either an early KO or a 50 that uses the magneto to run the headlight. The bike came with a spare engine that looked like it had sat in a mud puddle for most of it's life. My son and I were disassembling it to rebuild. It has the correct 3-wire stator and the neutral switch wire (the engine on the bike has the neutral switch but no wire). I swapped over the coils, points, condenser and wired it in. I'm getting spark but no other electrics. What am I overlooking? Could the rectifier be causing this? If it's bad it just causes battery to drain, right? Is there a way to test it?