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6 volt wiring, wire gauge question. diagram inside

Discussion in 'The Hokey Ass Message Board' started by rustybucket, Jun 11, 2009.

  1. rustybucket
    Joined: Dec 21, 2006
    Posts: 265


    I'm getting close to wiring my roadster (6 volts positive ground) and need to order my cloth covered wire. It has been recommended to me to go 2 gauges thicker in general for all components 6v vs 12v. I would like to double check and make sure I have the right plan before I order.

    Are there any electrical gurus out there that could look at this wiring diagram (from the Tardel book) and let me know what they would recommend regarding wire gauge for this type system running 6V. I alwready have 00 battery cables but for the rest, 2 gauges smaller across the board or???


    Attached Files:

  2. I would use 12 gauge for the headlights the reast looks ok
  3. rustybucket
    Joined: Dec 21, 2006
    Posts: 265


    Any other opinions?
  4. KJSR
    Joined: Mar 7, 2008
    Posts: 2,405

    from Utah
    1. Utah HAMBers

    Yeah the headlights seem very small gauge. 6v VW used 10 gauge for all the "heavy" circuits including the headlights. It may be worth the extra size. If you can wait until next week I have a chart at work that should tell the wire size based off of current/voltage but I'm not 100% sure it goes down to 6v (aircraft stuff).

  5. 39 All Ford
    Joined: Sep 15, 2008
    Posts: 1,531

    39 All Ford
    from Benton AR

    I am not an electrical engineer, but IMO the 6 volt wires are heavy enough to do the job...

    I used them on my 55 Lincoln conversion... I did not change diddly and so far so good...


    Duh,,, I get it now.... disregard my answer,,, I am a dumb ass...
    Last edited: Jun 11, 2009
  6. Jimmy2car
    Joined: Nov 26, 2003
    Posts: 1,707

    from No. Cal

    Try this guy: Wiring by Tyree Harris, 2693 Crewsville Rd Bumpass VA 23024, 804-556-5200 Great guy, makes really good stuff
  7. plym_46
    Joined: Sep 8, 2005
    Posts: 4,018

    from central NY

    Rule of thumb, heavy load, lights, heater fan, gen to bat, wiper motor, etc, 10 gauge
    medium load, running lights, signals stop lamps, iterior lights other accesories, lighter, 12 gauge
    light stuff, dash lamps, instrument lighting, misc stuff 14 gauge

    When in doubt go bigger.

    also more grounds, good grounds, and clean grounds and other connections are what 6 V likes.

    Battery cables need to be 0 gauge or the wide woven main ground strap.

    Also do ground the engine and the body to the frame.

    Also if you choose to put a battery cut out switch on it, don;t use those with the green knob on them. They don't pass enough current, put one in like they use on race cars
  8. Volts times amps equals watts, if you total up the wattage of the circut and devide it by the voltage it will give you the amperage to wire for,,,,or you can do what has been said. My .02
  9. rustybucket
    Joined: Dec 21, 2006
    Posts: 265


  10. Warpspeed
    Joined: Nov 4, 2008
    Posts: 532


    There are two ways to rate wiring gauge, temperature rise, and voltage drop. In a six volt system, voltage drop will become far more significant long before the wires start running too hot. Voltage drop also increases with the distance, so you need to think in terms of how far, and how many amps when deciding which wire gauge to use. As others have said, if in doubt go heavier. Apart from the cost of the actual wire, heavy will have all the advantages, and no disadvantages.
  11. lewislynn
    Joined: Apr 29, 2006
    Posts: 1,590


    I'm not a guru but a good rule of thumb is:
    Wire gauge is typically determined by amps not volts.
    40 amp = #8
    30 amp = #10
    20 amp = #12
    15 amp = #14
    Those gauges even work in your home with 110/220 volts

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