I want to make the LED ditchlights to come and off with the LED headlights on a HO  Bachmann SD70ACe loco that came standard with sound and headlights only. Can I wire the ditchlights to the headlights at the PC board?

I am changing the shell without ditchlights on a DCC sound equiped SD70ACe loco to a shell with ditchlights and the wiring is different, the new shell has a PC board that requires a small plug from the main panel that does not exist----theheadlights are wired direct with no PC board---not sure where to go from here? Any suggestions?