Rear window defroster defogger relay part number 10014885.  Removed from a Chevy Station Wagon, but used on several models of GM cars and trucks in the late 70s-early 80s.  This relay has been tested and works.

The terminals on the bottom are marked:

B= (+) positive battery power, hot all the time

I= (+) positive power when the key is in the run position

G= Ground

L= Load (the defroster grid, in this case)

P= Trigger, a momentary (+) positive feed activates the relay

I ship all parts in one day, and often the same day if the order is received soon enough.  If you see a longer ship time listed, I am out on a Jeeping trip and will mail your item(s) as soon as I get home. 

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