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Technical Too many volts coming from alternator?

Discussion in 'The Hokey Ass Message Board' started by slim tempo, Apr 19, 2020.

  1. slim tempo
    Joined: Sep 16, 2010
    Posts: 410

    slim tempo
    Member

    I am in the process of running wires in my 1964 Chevy Biscayne. I installed a 1 wire alternator and it is putting out 14.3 volts to the battery when the engine is running. I checked the voltage that runs to the ignition switch and it reads 14.3. I checked another lead to the heater and it read 14.3 volts. Is there supposed to be that many volts running through the system? With the 1 wire alternator, I am not going through a voltage regulator.
     
  2. Jack E/NJ
    Joined: Mar 5, 2011
    Posts: 585

    Jack E/NJ
    Member
    from NJ

    Yes. It's good. Jack E/NJ
     
  3. greybeard360
    Joined: Feb 28, 2008
    Posts: 1,468

    greybeard360
    Member

    Sounds like it is working like it should. Those sometimes will run around 14.6 - 14.7.
     
  4. onetrickpony
    Joined: Sep 21, 2010
    Posts: 427

    onetrickpony
    Member
    from Texas

    14 to 14.5 is good. You are right in the sweet spot.
     
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  5. anthony myrick
    Joined: Sep 4, 2009
    Posts: 5,808

    anthony myrick
    Member

    12 volts is a generic term.
    Your alt puts out more than 12, your battery stores more than 12
     
    Lloyd's paint & glass likes this.
  6. theboss20
    Joined: Dec 30, 2018
    Posts: 208

    theboss20

    Your numbers are good...a one-wire alternator has the regulator built inside the alternator...


    Sent from my iPad using Tapatalk
     
    Lloyd's paint & glass likes this.
  7. MAD MIKE
    Joined: Aug 1, 2009
    Posts: 496

    MAD MIKE
    Member
    from 94577

    1 wire alternators are internally regulated, and at that, they don't use the other two 'sense' wires.
    So your alternator is always going to show the higher voltage, it won't change.

    A 12volt system is really a 13-14.4 Volt system
    A 12vilt battery is really 12.4-12.6V battery.
    You can't charge a 12 volt battery with 12 volts, it needs to have a higher voltage to charge and maintain system voltage.
     
  8. southcross2631
    Joined: Jan 20, 2013
    Posts: 3,761

    southcross2631
    Member

    Some of the cheap 1 wire alternators have to be revved up the start working.
    Your voltage is right where you need it to be. When it gets over 15.0 it starts to cook the battery.
    I had an O/T 67 Camaro when I lived in Az. The regulator stuck and the volt meter went to 17 volts
    it had really bright headlights but you could smell the battery acid boiling. I had to buy a new regulator and a battery. I was on my way to New Mexico and it was the middle of the night so I had to keep going.
     
    town sedan likes this.
  9. slim tempo
    Joined: Sep 16, 2010
    Posts: 410

    slim tempo
    Member

    Thanks for your help. I understand it now.
     
  10. theboss20
    Joined: Dec 30, 2018
    Posts: 208

    theboss20

    If that ever happens to you turn on every load you can including the blower motor to high...or unplug the regulator until it settles down then plug back in for a while...will get you home.


    Sent from my iPad using Tapatalk
     
  11. 41rodderz
    Joined: Sep 27, 2010
    Posts: 4,720

    41rodderz
    Member
    from Oregon

    We all wish our alternators ran 14.3 volts .:D
     

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