Got it Mark. You need to be a magician to get in there though. As it was I used my 15yr old son's hands, then verified the cable with my own eyes. Black covering and inside was the expected BRN/BLK single lead. The spade terminal on P/N 930.606.118.00 doesn't look like mine though, I have a push on tip long thin nipple but it's definitely the one. I've amended the
picture to reflect the location. I've not pinpointed the location exactly 'cos all was done by touch 'n' mirrors and the picture's not from the best perspective.
Now the bad news, having taken off the lead I shorted it to earth, with and without the motor running with the same result, nothing, and with the switch in all positions
The earth connections are made on the top of the left/rearmost inlet manifold and were removed, cleaned and resecured.
Any more ideas on how to check
the heater controller?