Goldarrow,
Have you tried a test light on the wires leading up to the coil (yellow and blue)?Ground one end of the testlight ,put the probe in the yellow,ignition on, turn the motor over, do the same on the bue . If it's all good going up to the coil, the problem is at the coil or after the coil. Try removing a cap on #1 and #4, place a good spark plug in the cap and lay the threads on some clean grounded engine metal , like the new Allen head screw on the top of the motor. do not hang onto the plug or the wire, turn kill switch to run position,turn key on position,poke the starter button and see if that spark plug sparks. If it doesn't spark, switch spark plug caps with #2 or #3 and see if the extra spark plug sparks with that cap on it , if it does , its the caps .If it doesn't the problem is in the coil. Did you change the caps? Are they resistor or nonresistor type?
You can use the testlight just before the brakelight to see if there is power going to the switch. If there is activate the switch by pulling down on it and see if power is going through it at the connections under the seat over the rear fender. If that is good remove the tail lens and , inspect bulb,remove the bulb, apply brake and probe the 2 lead dots . if they don't light up , ohm meter the ground, then the wires from the connections over the rear fender to the lead dots. You should find the problem somewhere along this path.
A ways back , you mentioned issues with the blinkers, same test as brakelight except you use the blinkers ,not the brake. If there is no power where you start , check the fuse,fuse box connections- still no power remove the fusebox and check the wiring behind it for damage.the wires are tight beneath the panel , sometimes damage or corrosion has occurred. Repair and recheck all electrical devices to make sure they operate properly. It's a cakewalk really,don't sweat it and you'll find the problems.
The new video sounds better. RB
