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You can run a ton of items off the one switch if you really want to but just make sure to run the different light circuits (or other load) through separate relays.
I don't think that a headlight switch will work as I think that the heater switches have a resistor in them for the low fan speed. I guess that you could use a headlight switch if you wired in a resistor but why bother when as EffieTrucker has shown there are ample supplies of new heater switches. As to which **** to use that really depends upon your heater. There were many different styles and most were added on by the dealer (heaters were an option). Maybe "firstrider" will chime in here as he is our heater expert.
I'm not sure that you need relays if your truck is stock. If you are adding high watt head lights or fog lights most kits come with relays. But if you are doing this on your own then NAPA and AutoZone have many different types listed it depends upon your wiring and fuse block and current draw.
If you are switching over to LED lighting the current draw is so minor that I would not bother with a relay. Your switches should be able to handle the current without overheating.
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