Richard There is a wiring diagram in the Motor trader data sheets published 11March 1953, this is reproduced poorly in the Newby/Fletcher 50th Anniversary Collection, also the switch positioning is wrong. It appears the Choke switch is fed from the live side of the Reserve switch then on to the solenoid then to the thermo switch which earths when up to temp.Have a look at the TE21 wiring diagram located at the back of the handbook reproduced in the members section ,the set up is similar & the wiring diagram is very clear and the bit you want is at the top right of the drawing . I know my copy of the TA/TC handbook shows no thermo carb and for some reason no wiring diagram is shown in the members section reproduction email me direct if you need more clarification, <!-- e --><a href="mailto:npsmartin@hotmail.com">npsmartin@hotmail.com</a><!-- e --> Peter Posted by Peter Martin 13/09/2016 09:33:45