builder77

The pic that Bjorn posted above clearly shows a controller labeled as the engine heater. It show one switch being HI/LO, a light, and then a START/OFF/RUN switch. Once I have the heater at home I should have a better idea on this though as it appears to have the wiring diagram on the data plate. The wire I hope to get has the 5pin connector and a seperate wire, so I guess that is the one. I will have to keep my eyes open for a 24V coolant pump. My idea is to use this to heat the cab at a reststop perhaps, so that I can turn off the truck, and imagine forced coolant flow would be more reliable then convection.