Me and Wayne have gone through a lot on email yesterday.
Putting the power leads direct to a car, it seems the power supply was back-to-front. But an older Club Mk1 Truspeed worked fine last week, so that is odd
One new Truspeed doesn't work and the other is on full power. So, I also think there might be a wire or two connected incorrectly somewhere. That's why I think it best for someone to have a proper look, face-to-face, as it were.
Steve has told Wayne that the controllers are for a positive wired track - as per the diagrams on the BSCRA website, which is what we do in HO club racing and what Wayne has used. The only difference is we run the +ve wire to the left hand rail, which simply reverses the car's direction.
We add in the AB Slots diode brake switch to the driver station, so resistor controllers have brakes. We have a bypass setting for EC controllers (or the full brake setting). Put together it looks like this:
Controller wiring should be like this (thanks to BSCRA site):