First thoughts about possible causes of that crosstalk: The flasher unit is duff and it's happening within it. The wiring at the flasher unit or indicator switch is wrong. The wiring to the light units isn't correct.So I'd try another flasher unit, probably a different type. And if that didn't fix it I'd build the whole rig on the bench: lights, switches and flasher unit. ... Do you have a multimeter? And more gin? Jonathan