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To clarify, you replaced the alternator and battery and the new alternator is getting hot?
Let me see check the circuit diagram and see what might be back-feeding. Do you have a multimeter?
Check the alternator output with the engine running. Let me know how many volts it's putting out.
Try hooking everything up like normal and see what kind of voltage is coming out of the alternator.
It could increase temps a little if the charge is meeting resistance at the battery. Alternators are supposed to get hot, and 14.6 is pretty normal output voltage.
Does anything on the dash work?
It sounds like you have a failed instrument cluster if nothing on the dash is working. No speedometer, gauges, etc?