Greetings! I have been trying to sort out the headlight electrics on my 49 Mercury. I changed the car from 6 to 12 volts, and replaced all of the bulbs. The headlights worked at that time. Then I replaced the Turn signal switch in the steering wheel (it wasnt working) with a new switch for a 12 volt 56 Ford. At that point the headlights didnt work (but there is no logical connection that I know of between the turn signal switch and the headlights). I replaced the Headlight switch, still no headlights. Then I replaced the floor mounted bright-headlight switch. Still no headlights. I checked that juice is going across the headlight terminals on the headlight switch when the headlight switch knob is pulled all the way out. I verified that the 2 fuses under the dash are good, and that there is juice going across the fuses and the 3 circuit breakers under the dash. When I connect a hot wire directly to the wire that feeds the headlights, there is no spark, as though there is a circuit open somewhere. Is there a fuse or some other path I should be checking to try to solve this? Electrics are not my strong suit, any suggestions would be appreciated thanks!