It doesn't make any difference how the wires are connected to the switch. Test the switch. Both terminals should not have any connection to the case and should have continuity to each other at the preset temperature. (it should say on the case). Immerse in water and heat the water and watch the thermometer with a meter connected to the terminals. Near the prescribed temp the switch should show continuty. David Teitelbaum vin 10757 --- In dmcnews@xxxx, paulheymeson@xxxx wrote: > Hello list, > > After trying 3 switches and testing everything else as my last post > explained. > I proceded to put my hands on all the pipes to see if they were > getting hot enough,sure enough they were nearly burning my fingers. > So I was just wondering as my fans work fine if I join the 2 wires on >