I don't ever remembering any instructions for that unit. One thing I noticed is that is not the right controller for that unit. The controller is really weird, it has a spring powered large copper disc that spins about 1/2 revolution then stops. What it accomplishes is it interrupts the track power for a second which trips the 2 position reverse unit. 1 push of the controller button turns the horn on, another push turns it off. The lead power unit jerks a little when this action happens. The horn vibrator uses 2 AA batteries. It doesn't sound too bad for a single chime horn, better than expected. The HO whistle tender triggers the same way. I don't understand the engineering of the controllers spinning disc. Maybe some one here can go into it. That's about all the information I have. Service manual is of no help either.