I wanted to replace the noisy mechanical relay in my house furnace with an SSR. However I can't figure out how to wire the SSR. I understand the mechanical relay and how its wired. There are 6 terminals, Two are the +/- output voltage going to the blower motor, Two are the +/- input of the relay (line voltage) and two are the coil terminals (coil voltage activates the relay). On all the SSRs I have seen there are only 4 terminals, labled input and output. Some of the SSRs are calling the input the "coil" voltage so i can only assume that is the activating signal, and if so where does the actual input go for the line voltage?