wiring and switch on '78WR?

Located a full OEM headlight set up but I don't see a switch. Dumb question I'm sure, but are the lights always on or is there a switch? Parts diagram does not seem to show a switch. I see HVA Factory sells a wiring harness with switch for 70's thru 90's bikes.

If no switch then they are on while bike is running. Easy enough to put your own switch. I just drilled a hole on the side of my headlight and put in a switch.

I use an O.E. type light switch on both my 78's. They only perform dip/main and horn functions. The lights stay on all the time. The bulbs last alot longer if they are on ! Also it means you can be seen by others.
I also use continental yellow bulbs (as O.E.) as it offers a different light to all the other traffic on the road. Another chance you may be seen by a dozy car driver.

Just make sure you use a voltage regulator !

Yes, voltage regulator was part of the package. I'll just run it stock - lights on all the time.