If your bike has the stock front turn signals, they have 3 wires: ground, and 2 hots, one for the running lights, and the other for the turn signal. When normally riding, one element of the bulb is lit. When turn signal is activated, the lit element goes out and both elements flash for the turning.
If someone has replaced the stockers, chances are there's just 2 wires coming from the signal. These would be connected to the turn signal wires, and you won't have parking lights.
There should be a wiring diagram for your bike in the Manuals section on the home page of our happy little forum.
I hope this helps. Keep us in the loop, and good luck.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.