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As far as I know, without AlfaOBD, you need the resistor and harness kit from retroshop.us for the headlights.
https://retroshop.us/collections/featured-products/products/5th-gen-ram-2500-3500-hd-halogen-to-led-headlight-adapter-pair
Not sure about the fog lights. Contact retroshop.us to see...
https://hdrams.com/forum/index.php?threads/led-cargo-bed-lights-wiring.2430/
If yours did not come with the LED bed lighting from the factory, the connections aren't there. You have to buy the whole kit if you want to keep it OEM.