Does your bike have hazard flashers? if so does it work when they're on? They should use different flasher modules but I can't say for sure without a wiring diagram.
Do you have a volt meter? Can you check voltage at the plug to the signal to see if it's the signal itself of in the wiring before the plug.
2013 Victory Hardball - VM1DR cams, Lloydz filter, timing wheel, PCV-AT, 1/4 turn throttle, modified pipes
2008 Yamaha Warrior -Churchkey intake, V&H Bigshots
2007 Scion TC 5spd
1997 F150 -used to pull my car hauler
1989 Nissan Hardbody -absolutely indestructible
1968 Coupe Deville -all black, so nice