1971 right side markers dim when lights on | Ford Thunderbird club group 1955-2005 T-Bird models

1971 right side markers dim when lights on

T
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Thunderbird Year
1971
On my 71 all of the stop and turn signals work correctly when the headlights or parking lamps are switched off. When switched on the right side marker lights go very dim. At this state the front and rear turns work but the rear turn doesn’t sequence although It sequences normally with lights off. With headlights switched on a press of the brake pedal instantly lights the left brake lights as it should but the right instantly sequence once until on.
when the headlights are on the right signal indicator is illuminated which tells me the normal path is interrupted.

I’ve studied the heck out of the schematic I have and it’s simple but omits what goes on inside the sequencer and column switches. I’m unable to see visibly and understand how the circuit is completed with the park lamps powered. Really scratching my head. Could use some tips.

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