[David Dunlop]

Thanks, Chris and Sweet Dreams.

I pulled the plywood back cover off the switchboard this morning and started a detailed visual. There are nine factory original, lacquered, cloth loomed wires surviving, all related to the INTERNAL LIGHTING Switch on the upper right of the switchboard, and the BATT, No. 1 ON CHARGE FROM Switch directly below it. Only one is still correctly installed.

The bank of input terminals down the right side of the switchboard all have red, positive leads fitted to negative terminals and black negative leads fitted to positive leads and when I compare to the circuit diagram, not even the correct input terminal pairs have been connected correctly.

The INTERNAL LIGHTING Switch has absolutely nothing to do with the 12-Volt OUTPUT TO WIRELESS Terminals in the centre of the switchboard, yet is the switch the leads for these two terminals come from. Have yet to trace where that mystery circuit ends up.

In addition to this major issue, I can see where at least two negative leads are no longer in their original factory positions and have been refitted to the switches with great creative licence and likely a high risk factor if any significant DC Power was ever applied to this switchboard anywhere.

On the positive side, however, speaking visually, I took advantage of the time looking at the wiring to also map out the terminals on the backs of the four switches for easier identification and cross reference to the circuit diagram. I sketched the layout of the terminals and posted a photo of same below. The identification codes are stamped into the porcelain by each terminal. The three across the bottom are in small, near square, depressions. The three across the top are noticeably larger, more rectangular depressions.

Be interesting to compare how these AH&H Switches in Canadian Switchboards compare in layout and coding to their British counterparts which I recall might have been made by "Arrow".


David