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I have a dim, driver's side lowbeam headlight. Used to be as bright as the other 3. Replaced the light and made no change. This is on a 69 mach1. Where do I look and for what? TIA.
 

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Trace and recheck all ground wires along the path of that circuit in the harness. This includes the other side. I had one light that was at about 2 watts of power until i re-installed the ground with a better connection (watch for paint buildup). It fixed the problem (had to use nut/bolt instead of origional shet metal screws) Good luck!
 
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