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Technical alternator wiring?

Discussion in 'The Hokey Ass Message Board' started by robtlor, May 6, 2017.

  1. robtlor
    Joined: Dec 7, 2010
    Posts: 118

    from Lincoln NE

    Ok guys, I have searched the old posts and cant seem to find what I need. Using an internally regulated 3 wire alt as a 1 wire. It drains the battery. If I unplug the small short wire going inside the alt drain is gone. So I think I can either put a diode in that short wire so current will only flow one direction or take the wire to the switch so it is disconnected when switch is off. Is this right?
  2. Mr48chev
    Joined: Dec 28, 2007
    Posts: 28,142


    I thought they had to be coverted to 1 wire with a plug setup that probably contains a diode. Never saw a viable reason to run a one wire alternator unless it was on a farm tractor with a magnito like they were originally designed to be put on.
    Every 1 wire alternator designed for 1 wire hook up has a plug similar to the one in this photo

    This is pretty much a standard 3 wire hookup with light.

    This I believe is what you are asking about.
  3. I never saw the attraction of a 1-wire alternator outside of stock cars. Most wiring kits are set up for a 3-wire, but you can do them as a 1-wire losing the exciter wire, IIRC.
  4. flynbrian48
    Joined: Mar 10, 2008
    Posts: 6,922


    The advantage of a one wire alternator is one wire...
    54vicky likes this.

  5. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,714

    V8 Bob

    The alternator will work better (as designed) if you leave it 3-wire and connect properly. Just two additional wires and a diode and/or a 194 bulb.
    You can change the regulator to convert to 1 wire, if you insist on one-wire.
  6. BJR
    Joined: Mar 11, 2005
    Posts: 6,706


    If you run the #2 terminal of the plug to a junction block as close to where all the accessories are connected you get the added benefit of voltage sensing. Voltage sensing detects a drop in voltage where ever the sensing wire is connected and boosts alternator output to compensate for the voltage drop in long runs of wire. If connected at the alternator, it is sensing voltage right at the alternator so you could have less then optimum voltage down the line where it is being used.
    bct likes this.
  7. ffr1222k
    Joined: Nov 5, 2009
    Posts: 1,135


    If you wire the 3 wire alternator like Mr48 shows you will only add 1 wire. If you ran that wire through a bulb you would gain an idiot light. Or you could use the diode. Either way it is only one added wire.
  8. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,129

    from Kansas

    You could wire the exciter wire to the accessory terminal on ignition switch without diode or lamp in series. Also the sense wire should be routed TO the closest it can be to the battery. That way the battery will have correct charging voltage.

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