I've changed the bulb several times same turn signal. It will sometimes work as a running light but won't flash other times won't work at all.

 

You may want to start tracing wiring.

Also, try moving your handlebars from left to right and see if that does anything.

Hook up either a battery tender or charger on your bike (to prevent running your battery down) and turn the turn signal on and start moving/lightly pulling wiring while watching for the light (to hopefully blink) or give you a sign that you located the problem.

Pay attention to connections and ground wires.

Not impossible that you could have a defective module but check the easy, cheap stuff first, including the turn signal switch on the handlebars.

Be patient and good luck.