I think I see an issue. Why is there a purple & yellow wire on compressor contactor coil connection as seen in your first pic? If you look at the schematic it shows 2 yellow wires on the coil connection and the purple goes to the transformer. Maybe get a close look at that and snap a few pics for us.
It looks like #5 would be for the 2nd stage of heat if you had a 15 or 20KW heater package.
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