Apologies Steve for jumping in but this is a fascinating puzzle!
The thick red wire exiting the control box was earthed at the open chassis box section but, as you say, became detached during dismantling. This earthed wire by-passed the control box relays.
Zickleer, please confirm to which colour wires you have connected the resistor and where those wires go. I can't tell from the photographs.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
Last edited by SD1too; 28th July 2019 at 14:01..
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