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?
Well, looking at the product, there appear to be models that have ditchlights. It appears that models that aren't factory equipped with ditchlights don't have the ditchlights housings. This isn't an available part on the webpage either. Ditchlights castings aren't hard to find, and you can wire some surface mount leds within them and attach them to the appropriate leads on the board.
Once this happens, the ditchlights will be triggered with an alternate function for the ditchlights. Since there are two leads on the board (one for each ditchlight) they will alternate. If you want the ditchlights to come on with the headlight, then you will need to configured the decoder light outputs and functions to your liking (look in the soundtraxx website manuals).
I have officially said ditchlight 9 times in this post lol