One Headlight Bright and One Headlight Dim

Hey guys, I just finished putting in a new 340 in my '70 Dart along with a firewall forward engine and light wiring harness. Everything works perfect except for my headlights, when I turn them on, the drivers side is lit up bright but the passenger side light is very dim. Any ideas? Thanks. I know its not the light itself and everything appears to be wired up correctly.

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