OK... attached are pics on ERR installation and the PS1 electronics removed in 2015. Any ideas and/or suggestions are very welcome. Still, the conventional activity, the "clank" sounds and neutral response to direction control, from ERR TMCC DC Commander is the really strange occurrence. And other than the tether, 4 pin, running through the B unit and to the dummy A, there is only the lighting modules in the A units for direction headlight and Mars lights. Am I missing something here? What? I have done many ERR conversions, and this one worked fine for years until today, with no shorts, derailments, etc.
Jesse TCA