Need help with a Dodge Charger question.

Bewy said

Agree that relays are a good idea for incandescent HLs, especially a four HL car. Quite a bit of voltage drop through the harness & correctly wired relays will reduce this & give brighter lights. Relays not reqd for LEDs because of the low current draw.

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They still draw more power than would go through the switch with relays. The relay set up isn’t likely to make them brighter like running relays with incandescent lights, but it still lowers the draw on the switch. So it’s still a good idea.