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Scott,
From the picture your relay got wet and shorted out and that's what cooked it. It took less than 30 seconds to fry it probably.
Continuity is a goofy thing with relays. When your Thermostat calls for air it puts 24V to your relay and it snaps, which then makes connection to start your AC and you will have voltage across two contacts. . So when you do continuity on a dead (no volt) you should have continuity across the other side only. Going from memory now. It is easy to test with VOM. Disconnect the wires going to the AC and turn the thermostat and find the 24v from Thermostat. Hook the wires to the relay and you should have 24v going to the AC unit.
The relay part number I have is 1890A13 from the Armstrong Service guide. The fan relays (2) is part 237-07. One for low speed and one for high speed.
I believe you can use any relay with the correct number of terminals and as long as it is rated for 24v and as Andy states heavy current draw. The Granger catalog shows a bunch with descriptions and the part number may not be the same.
I would be interested in the service manual if you can PM it too me.
Good luck,
Gary
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