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julie_m · 14th Sep 2018, 11:15 pm

Never mind, I've had a better look at picture 2 and I think I can see what's happening. The neutral side of the mains switch (RH end of the photo) is connected by a thin black wire to the middle terminal on the 3-way tag strip, which goes to chassis and also connects to the white motor wire. The black motor wire goes to the live side of the mains switch (inwards from the edge) which also has a large green 100Ω resistor connected to it. The other end of the resistor goes to the right hand tag. The red motor wire goes to the left hand tag, then through a large carbon resistor to one of the valve pins. So it looks as though black is live 240V, white is the common neutral and red is the 90V heater supply output.

Is this how you're seeing it?

14th Sep 2018, 11:15 pm	#7
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Gerrard to bsr Never mind, I've had a better look at picture 2 and I think I can see what's happening. The neutral side of the mains switch (RH end of the photo) is connected by a thin black wire to the middle terminal on the 3-way tag strip, which goes to chassis and also connects to the white motor wire. The black motor wire goes to the live side of the mains switch (inwards from the edge) which also has a large green 100Ω resistor connected to it. The other end of the resistor goes to the right hand tag. The red motor wire goes to the left hand tag, then through a large carbon resistor to one of the valve pins. So it looks as though black is live 240V, white is the common neutral and red is the 90V heater supply output. Is this how you're seeing it? __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.