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Upgrading 6v to 12v in an old car

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  • Upgrading 6v to 12v in an old car

    Anyone have any first hand knowledge or insight on something like this?

    Last weekend at the Decatur swap meet we picked up a '53 Ford Customline 2 door, 215 inline 6, 3 on the tree. It runs and drives fine but the wiring on it leaves a little bit to be desired. Obviously over the last 50 some-odd years it's been hacked up and brittle. One of the previous owners wired in a brake light switch on the brake pedal and an aftermarket turn signal. All of that stuff only works part of the time, plus the horn isn't working and the headlights are about as bright as a dead flashlight.

    I've tried to read up all I can on converting over to a negative ground 12v system. Seems the main components would be the battery(obviously), the ignition coil, lights, voltage regulator and generator(or switch to alternator). Some have also said a starter solenoid, and will need voltage reducers for the gauges, blower motor, and wipers.

    Does all of that sound about right?

    Plus I figure while I'm at it I should replace the wires that are all falling apart. I dunno what's better though, replacing it all with a new harness (like a Painless style) or just trying to buy reproduction harnesses from the restoration places.

    Oh and I fucking HATE trying to wire stuff up so this should be a fun project LOL
    --Marcus

  • #2
    Buy a painless wiring harness and strart from scratch imho.

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    • #3
      6 volt to 12 volt

      Change all lamps, voltage regulator , and coil. Be sure to get a 12 volt Ford coil with the built in resistor. Change the condenser in the distributer, I think the dash gauges with work OK. Put a resister on the heater blower fan, or change to 12 volt. The wipers are vaccum and will be ok. The six volt starter will work and will start the car a lot better. Of course you could have it re wired, but I have run the 6 volters for years on Flathead v-8's. I would change to a 1 wire Delco alternator and forget about the voltage regulator. If you want to run the generator, you should be able to switch out the field and armature from a 12 volt Ford generator. Be shure it is a genuine ford so the bearings will be the same. I did that many times on the Flathead V-* generators. If you have a radio that works and is still 6 volt, you will have to use a dropping resister. Those old 6 volt starters will really spin a motor when on 12 volt. You would think they would get too hot, but they actually pull less amps, and the car starts really fast if everything is right. As to that brake stoplight switch, on those old Fords, the switch screwed right into the back of the master cylinder. Hope that helps

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      • #4
        PM sent

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        • #5
          Post up pics . Love those cars. I liked the 55 ambulance that was on the back row .
          2009 Mustang GT
          1972 Country Squire

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          • #6
            What about the difference in grounding? Positive to negative.

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