73 Dart Alternator doesn't show charge anymore.

SputnikOne said

First off, the red primary wire goes to this metal thing under the steering collum, not entirely sure what this component is for

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If this is related to the photo in your post 1 the photo shows the brake light switch.

It has constant 12v and goes into a normally open switch, when you press on the brake pedal the normally open switch closes and sends power to the brake lights.