Bought 6v flasher relay off eBay for my 1971 ct 1.  Hooked up Rear blinkers.  Doesn’t flash, doesn’t light.  Reversed terminals, br/w to B, br to L:  continual lights but doesn’t flash.  All the above using blinker switch.  Direct wiring br to br/w, continuous light at flasher with blinker switch.  Bad relay I’m guessing.  Any suggestions other than buying another relay

Clue is "hooked up rear blinkers".  Many flashers require the correct load to blink.  Some are even sensitive to bulb wattage.  Try connecting both front and rear lights and see what happens.

When hooked up to correct terminals, there is no light. If too light a load, usually weak blink. I don’t have front blinkers but will consider that. I’m puzzled by light only coming on when hooked up incorrectly

What's written on the relay. On ours in NZ i seam to recall 8wx2+3. 3 being the one in the tacho to show its blinking. If the blink was too slow we'd go to 10 watt. Need a good battery plus the charge wires swapped over to max charge if you're doing mostly around town riding. If you're in US it might be totally different of course.

I haven’t got the wiring sorted so that anything lights in tach yet

I was having a similar issue with my 72 dt2 250. Signals werent blinking, just staying illuminated and the original flasher relay was just making a steady humming noise when the turn signal switch was engaged. Making sure that all signaling bulbs are the same voltage, 6w I think and that the rear blinkers had ground wires connected.

I also went in and cleaned out the bullet connectors with some contact cleaner.

Purchased new relay at auto parts store and blinkers now work. Can hear relay click too

Charlie72, if you mean 6watt that sounds a bit light on wattage. If you mean 6 volt then what wattage is on the bulbs. Or is yours ok now. I'm not fully up on the story.