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Seriously depends on what unit you have. Model # & serial #? You can "jump" R to G at the unit. If its a standard Goodman AHU there may be a terminal block or just some wires that were factory installed outside of the unit. R to G will send 24v to the blower relay, sequencer or board (depending on model) energizing the relay and then returning to common. If you have tried that you should ensure you have proper line voltage 220-240vac. at the service breakers on the AHU.
From what I can gather it seems like a power source error (red wires attached to the transformer) is allowing it to keep running. Another possibility is it could be your speed tap. These are my speculations about what is occurring.
Can you set your thermostat to on instead of auto on the fan? If this fixes it it would be a loose connection at the themostat or broken wire. (broken wires are very common and they will make and break connection they break because the copper wire is small and it gets scored when stripped) I do not see a way the outside unit could cause your problem. If it was any circuit board it would be the one in the furnace.
If you turn tstat off does it still run. If so you have sequencer stuck. Replace sequencer. Also you may ahve abad defrost board out side. When a unit goes into defrost it will bring on heat so you will not get a blast of cold air. Sometimes the defrost board sticks and keps the heat on. Disconnect white wire at outside unit to break circiut. If hat goes off bad defrost board. You can change that yourself. Keep in touch Rus