Report Electrical in 1965-83 Avanti Posted January 17, 2018 · Edited January 17, 2018 by WayneC I'm not an electrical guru, but I have chased a few shorts on my various cars over the years. Getting too old to do much of that anymore. I assume everything was working before you took that panel apart? What was your first indication that you screwed something up? Did you see sparks or smoke? When you say you substituted the "a/c switch", did you really mean the heater switch? Actually, the headlight, instrument, and heater switches all have the same part number, so you probably eliminated the switch as the problem, assuming you (re)wired it correctly. Does the horn work? Do the interior lights work? Do the instrument panel lights work? Does the heater work? Are the headlights dead on both low beam and high beam? Obviously some circuits (excepting headlights and parking lights) in the headlight/tailight circuits ARE working, and the issue is probably forward of the instrument panel. So, assuming the FRONT turn signals are working, you are looking for wiring components common to the headlights and parking lights, either positive or grounding circuits. I'm not sure, but I'm wondering if the headlight hi/low beam switch provides ground for both the headlights and the parking lights. The Stude Avanti shop manual (hopefully you have one) has a fold-out electrical diagram and a list of the wires called out on that diagram. Some time ago I scanned the diagram (half at a time) in hi-res, then joined the scans. That way I can view the diagram on my 27" computer screen, enlarge parts of the diagram I need for a specific task and print those enlarged parts, then I use hi-liters to trace circuits related to the devices I'm troubleshooting. Using that method you can figure out what wires (and/or fuses and circuit breakers) are common to the headlights and parking lights (but not related to the turn signals and brake lights), see where they terminate, and try to test those paths for continuity. I think the power for the headlights comes through the circuit breaker at the top of the fuse panel on the firewall, to the upper left of your left knee, but I can't recall if it automatically resets.