I have looked through the forums and cannot find this issue. Every one says "ground" must be the issue? Looking for any help! Installed new printed circuit in my 77 c10. (purchased from ). Everything works just as it should. All dash Lights, gauges, etc. with the following exceptions. With Headlights OFF The issues are: 1. Left turn signal works but indicator in dash does not light 2. high-beam switch works but the dash indicator does light. The fuel gauge needle bounces in time with the left turn signal. With the headlights ON the left turn signal does not work at all. This truck is very original and the wiring is not all cut up. The bulbs are all tested and are good, I have cleaned all the connections and cannot find any corrosion. Can it be the Headlight Switch??? I am at a loss. Thanks for any help.