Well that all went a bit pear-shaped. I decided to give everything a degrease and couldn't start the thing at all to test as you guys suggested. I noticed a wire had become disconnected and the piece I think it was connected to fell out. I can see the square hole this piece should go in but no idea which way up or down it goes. Do I push the plastic piece down into the hole or up from the bottom? Any ideas gratefully received?

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