Good evening all,

New member here, looking for some senior insight on an electrical issue surrounding my headlights.

I have a well used, but loved 1979 C3 Corvette and have been doing upgrades, as time allows wanting to "freshen" her up. 

My first issue was the lazy headlight buckets, which I quickly remedied with some aftermarket motors.  When I began to tear into her, I realized that if you're going in this deep, might as well go a little deeper and take the bull by the horns, meaning I was replacing not only all the vacuum jazz for electric motors, but added new LED lights, aftermarket headlight wiring harness (which ties into original / plug n play per se), new headlight switch and associated mounting brackets/hardware for each light, since most of it was broken and or brittle to the touch etc.

Anywho, after the install, I noticed that my headlights only worked on hi-beam.  When I switched to low-beam, I have all 4 lights looking me dead in the face laughing....nadda.  Click dimmer switch to hi-beams and voila...all 4 are on shinning bright.  

I thought the dimmer switch may be a culprit, so I bought a new one (mounted on column).  Before going through the PITA  true install would be, I just connected it to the existing harness as a "soft mount" and clicked with my thumb.  Lights still act in similar fashion....no low beam, but high beams are brighter than the sun.

With the new after market harness, it has 2 relays.  I swapped both of them for brand new and tested relays, with no change in symptoms...so I am stumped.

Any idea there fellers?

New LED lights...

Verified dimmer is good...

Swapped relays for new/tested and known good ones...

Checked all grounds...

Checked inline fuse...

I am truly stumped.  Electrical is not my strong point by far, but was curious if anyone had an idea, or place to poke next.

Many thanks in advance!