Ok guys, mystery solved. I ordered a wiring diagram off of eBay.
Here is the page that identifies the relay:
And the detail:
There is a timer that expires 30 mins (+/- 10 mins) after the ignition is cut off, so no constant draw.
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1980 Chevy K10 Silverado -->
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My wife told me I spent too much time on Facebook. So I bought an old truck. Now she wishes I was on Facebook, it was cheaper.
