1971 Ct 1.  Trying to sort out wires.  Have battery power to rear blinkers, tail-light and horn.  No power to headlight or light in top of bucket, which I think is bright indicator.  I know engine must be running for headlight and I assume indicator to work.  Had tach wires hooked up as I could but no gauge lights or indicators working.  Did not have blue female paired up from tach.  Now all 6 unhooked.  Assume they pair up, but how and how can I test them?  Which wires from harness should bring power into bucket?  Have a brown with battery power and a dark brown with no power.  Should have power for front blinkers and gauges and indicators but I’m not finding enough.  Suggestions welcomed.

My assumptions are that gauge lighting would be powered when the headlight is on, ie when the engine is running, and that the tach gauge indicators are for the blinkers and neutral switch-which I would think would run off the battery. I have not tried to start the bike yet as it’s in my house as I sort out it’s various details first.

When doing my own tests in the past, I have found it easier to disconnect all of the wires, remove them from the headlight and then take off the headlight bucket. There is then a load more space and light to work in. Reverse the procedure once everything is sorted.

The wires can get dirty and also fade over time, making things even trickier!

You should have triple females for both sets of indicators - dark green for right and dark brown for left.

Front indicators should earth on the handlebars - paint/powder coating can inhibit this.

You can use a battery to test the indicator, clock illumination and headlight bulbs.

If you have a circuit tester (I use a light, but volt meters work just as well), you can test the main ignition switch using the 'legend' shown in the service manual (available to download from the Tech Library).

Don't forget that the engine needs to be running and the ignition switch needs to be in the second position for the headlight and clock illumination lights to work.

If you're using the original 6v system, as opposed to a 12v conversion, then make sure that you fit a 6v voltage regulator, or a 12v headlight bulb. If yours is a sealed beam unit and it has blown, then a replacement is needed.

Just seen your second post.

Yes, horn, indicators, brake and tail light run DC from the battery. Headlight and clock illumination lights run off lighting coil when the engine is running.  

The blue that powers the gauge illumination wiring gets power with engine running. 

Brown is key-on battery power.  Dark brown and dark green power the signals. If the rear signals work as you stated, then the dark brown and dark green should have power in the bucket with the respective signal on. 

The turn signal indicator in the gauge is somewhat "genius".  It's a very low wattage bulb with left and right signal "power" wires connected to it.  When the turn signal switch selects right turn, the dark green wire to the gauge indicator bulb gets power.  The indicator bulb grounds through the dark brown wire that is connected to the left signals...  Yes.  It grounds through the bulbs on the opposite side of the bike.  This works because the power flow through the tiny bulb filament is not enough to make the high wattage signal bulb filament glow.  When you select left turn same thing in reverse, the gauge indicator bulb gets power from the dark brown and that lights the left bulbs and it get its ground though the dark green connected to the right side bulbs. 

Found and got all the respective wires hooked up to the tach. No lights work, but I’ll wait until I get bike started to see what happens. Thanks for the assistance