I had this re-built a couple of months ago. I got it back and he took out my stud rectifiers and put the disc type back in. I got the stud back in and it will not blow a railsounds horn or whistle tender. Disconnected the stud wire and put in a Diode which I had in for 10 years and Whistle or horn on sound board will not activate. I am getting about a 5v increase when switch is activated so why won't the sound boards work. He told me when I picked it up that it would not operate modern electronics. But I thought this up grades would allow for that....Any opinions??