After running out of propane, try lighting the appliance farthest from the tanks. At a minimum, light one of the stove burners, I find that usually works well enough. Or, if you have an electronic ignition furnace or water heater, turn them on for a minute or so. But your '70 may not have those things.
The red button on the refrigerator will essentially bypass the safety thermocouple and allow it to reset. Once the burner in the refrigerator has lighted, you only need to hold the button down for about 30 seconds more. Any further pressing will do nothing. The 30 seconds is to heat up the thermocouple safety system. Once the flame stays on without the button depressed, you are good to go.
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