Rear window defroster

Well I work at a place that at one time was a huge junk yard . The junk yard went out of buisiness along time ago . And now we run a used appliance store and appliances scrap yard . When I started there was 3 or 400 pieces of glass in the basement . And the heated glass was one of them . I have barracuda back glass two years and three dart front glasses . So I have planed to put the heated back glass in from the start of my build . I searched ebay a found the switch for 10 bucks . I was able to find the patent Form on the switch and it has a lot of detail but not how to wire it . The switch is one that there on and off . Not high and low setting so I'm guessing you would just have to chose from one or other . As for running it threw a relay guess I could do that I'm running fan , fuel pump , and msd box threw relays all ready and have an extra relay on my board so guess I could do it that way use high for the glass and low for the light on the switch so that it only lights up when on . Hoping some one will chime in that has this option on there car and let me know how it wires from the factory for I don't find any info on the web except the patent info thanks for your input. P.s the company that made the switch is still in business maybe I will try and contact them

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