Ed,
Are you saying none of your running lights are working? That is port, starboard, bow and stern lights. If that is the case and these are all separate fixtures, then you need to check the common portions of the
wiring. Somewhere the positive wire from the switch splits into wires for the separate lights. Also, somewhere the negative wires from the fixtures come together to a common negative
battery connection. Check those common wires and connections.
John