my T11 turboflush does not run?

T11 has eben running OK for several years apart from the occasional blockage. This latest blockage I sorted and put it back together but it doesn't run. I wonder if I have put the 4wires back wrong (brown, grey, black, blue)
I noticed some of the soldered joints are loose (the ones soldering the pressure swtch, and teh one foro teh grey wire).
It ahd been on in the jammed position for a while but teh motor does not smell as though it overheated.
Anyone got any ideas?