The front winkers are also running lights. They use a dual filament bulb. In order to make the bulb wink bright dark bright dark, (instead of bright dim bright dim) the control switch turns off the run light for the side that is winking.
The right side winker filament is driven by the LB wire from the turn switch. Do you get voltage on the that wire when the switch selects it? If not, find the disconnect. If so, check the socket contacts.
Cheers,