Pat, I have installed several ERR sound only kits in locos. This one was working fine as I tested it several times as I was installing it. I did adjust the volume with a small metal screw driver... no wires touching, mounted on foam board. The only thing I didn't do was place a baggy over the unit as I usually do, as nothing was touching the unit..... I placed the plastic shell on and track tested it. Nothing... This is the regula ERR sound board for a diesel that sells for $95.00 from Scott Man'...........
I was wondering if anyone knew of a testing system other than hooking it up to a transformer directly, as was mentioned by another forum member...
It is not a commander unit as shown in the photo. Probably should find a picture of the actual ERR sound board.....
Thanks for your interest'..