I have just installed the headlights on my 69. Both high and low beams work but are extremely dim. I am thinking it is a grounding issue but I have not investigated it further. My question is this is is there a separate grounding wire for the lights, I think i may have read that their is one that grounds in the area of the radiator support, or is it included in headlight harness from the firewall. I have grounded the engine to the firewall and the new under dash harness is grounded, all harness are new. I have not replaced the headlight switch or the dimmer. Any help would be appreciated