I think Atomarc and I were hoping you have the old fog lamps that had bubs which would be an easy change out. I guess you could run them in series if you had seal beams, but the socket for the lights couldn't be grounded on one of them. I think that would be your problem on the series setup. The resistor in line will work but it is going to be a big one wattage wise. Let see...6 volt system, say a 60 watt bulb, and P=IxE, so the bulb is a 60 watter in this case. Plug in 12 volts and leaving the wattage at 60 for the light you will need a .6 ohm resistor rated at 60 watts. That as the old saying goes, "Is a wopper!" What I really think what you need is a 6v zener diode capable of handling the current.
