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One dim low beam and faintly glowing highbeams

67RTblue

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Detroit
67 RT with new wiring except dash harness.
Original headlight switch-new high beam switch. Bulbs are original or very old replacments.
During this years Woodward Cruise I noticed the passenger side low beam was dim. The drivers side was normal brightness but the high beam filaments had a faint glow. When activating the high beams they (high beams) would come on normal. I tried wiggling the plug on the backside of the switch-Nothing. Wiggled all the plugs on the headlight and this sometimes worked. I also loosened and re-tightened the ground on the radiator support and this too sometimes fixed it. Car has been on the road since 2017 without any issues till now.
Thoughts??
 
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