You will need a new harness for the defogger to work correctly. It should be similar to what I pictured above. Depending on what plugs are used with the new harness will determine what plug you will need at the switch end. But I'm willing to bet it will be like mine.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
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