Installing new WiFi Thermostat-Forced air gas furnace & Air Conditioning


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My Thermostat has proper wire connections (see image) with Rc and Rh (R) red wires, a black wire to G (instead of green wire), a white wire to the W, and a yellow wire for the compressor going to the Y terminal, BUT there is another black wire also connected to the Y terminal along with the yellow wire.
Anyone knows what this black wire on Y is doing?

I am basically trying to look for the C wire, which is required for the new WiFi thermostat.
1986
 

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