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Amp gauge or Volt gauge?

Discussion in 'The Hokey Ass Message Board' started by dirttoo, Nov 12, 2013.

  1. dirttoo
    Joined: Feb 17, 2009
    Posts: 136

    dirttoo
    Member

    I am looking at the under dash triple gauge kits and I see some have amp gauges and some have volt gauges. Which would I want for my street SBC powered "60 Falcon.
     

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  2. Ammeter is 'old school' and 'period correct', but requires that you run the entire electrical system load (except for the starter) through the gauge to be accurate. This puts a high-current wire inside the car, and a gauge failure kills everything.

    A voltmeter can be tapped in to any switched voltage source and uses low current; much safer.
     
  3. I'd go with volt .

    Depend on 100% period correct

    And if you want to know how much you have or how much you are using :)
     

  4. N2hotrods
    Joined: Jul 6, 2010
    Posts: 146

    N2hotrods
    Member

  5. oldsjoe
    Joined: May 2, 2011
    Posts: 2,544

    oldsjoe
    Member

    Volt meter is MUCH safer Amp gauge can be fire hazard if a malfunction occurs.
     
  6. dirttoo
    Joined: Feb 17, 2009
    Posts: 136

    dirttoo
    Member

    Thanks guys, I will go with the volt gauge.
     
  7. Getting opinions is good but you need to make your decision based on what "you" are wanting to know.
    Volt gauge - shows output of charging system
    Amp gauge - shows draw on system
    You can have a charging system show things are charging well on a Volt gauge but you don't have an indicator if it is keeping up with electrical demand. An Amp gauge will tell you if the charging system is keeping up with the demand or not. A fire hazard is only a possibility with an Amp gauge if a fuse or fuseable link is not used.
    Hope this helps.
     
  8. Brand Apart
    Joined: Jan 22, 2011
    Posts: 785

    Brand Apart
    Member
    from Roswell GA

    if you wanna be ultra period correct you can get a volt gauge and have the face reworked to read "amps" it can say anything you want as long as you understand what it is no problem.
     
  9. Dan Timberlake
    Joined: Apr 28, 2010
    Posts: 1,327

    Dan Timberlake
    Member

    I'd say if the voltmeter is showing much over 13.4 volts as each additional accessory the charging system is keeping up with demand just fine. If turning on the heater fan, headlights, rear window defroster and 100 watt stereo makes the voltage drop below 13.X an ammeter would show zero or negative charge too.

    Once an internal cable connection between regulator and alternator went "bad" and smoked the ignition module in about a second. the no start condition was obvious.
    Once I had a regulator fail "on". The headlights were a touch brighter which caught my attention. A diagnostic voltmeter reported over 15 volts, which would have been in the red zone of OEM dash units. An ammeter should have shown relatively high charging amps. Fortunately the ECU survived fine.
     
  10. ffr1222k
    Joined: Nov 5, 2009
    Posts: 1,178

    ffr1222k
    ALLIANCE MEMBER

    I put a voltmeter movement in an ammeter on my daily driver. It had a shunt type ammeter and didn't work anymore, and I put a larger alternator on and had to redo the wiring anyway.

    I put the needle with 0 amps being 12 volts.

    It works well.
     
  11. dan griffin
    Joined: Dec 25, 2009
    Posts: 484

    dan griffin
    Member

    Volt meter. Griffin Auto Electic
     

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