14+V at battery when running, why is AMP light on?

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  • Odrapnew
    Everyone likes being blown.
    • Aug 2003
    • 2880
    #1

    14+V at battery when running, why is AMP light on?

    A few weeks back, my AMP light came on in my 89 stang and I finally got around to looking into it. The light came on when I was in Bloomington and I drove it all the way home(~25 miles) without any issues(even running AC).

    I have a 130 amp alternator in the car(was used when I put it in). I also have electric cooling fans(Ramcharger).

    When I started the car today and turned the cooling fans on high, the A/C with fan on high and highbeams on, the voltage at the battery was just over 14V. With all accessories off, it was ~14.5v, still not excessive(right?). With the car off and battery still hooked up as usual, voltage is 12.6v. Gauge on the dash is right in the middle with or without all the accessories on.

    What would cause the AMP light to be on, yet the battery voltage is in the normal range?


    EDIT: SOLVED...maybe. I looked under the car and the small gray plug looked to be mostly out of it's socket. I haven't started the car, but I'm guessing that was it.
    Last edited by Odrapnew; 08-16-2012, 07:49 PM.
    Tags: None
  • POOPY PANTS FACE
    EAT SLEEP POOP
    • May 2007
    • 12400
    #2
    Resistor went bad on the alt.
    Originally posted by LTDpower
    TCS auto ftl
    Originally posted by Fernanernie
    When someone calls you a racist, tell them: You try watching your peaceful, clean, safe town that you grew up in and loved turn into a dirty, crime- and drug-ridden shithole all at the hands of one segment of the population and then come tell me I don't have the right to loathe the perpetrators.

    Comment

    • Chrm97PI
      268ponies with more onthe way
      • May 2005
      • 3413
      #3
      14.5 is excessive

      Comment

      • Odrapnew
        Everyone likes being blown.
        • Aug 2003
        • 2880
        #4
        Originally posted by POOPY PANTS FACE View Post
        Resistor went bad on the alt.
        Need new alternator or can I replace the resistor?

        Originally posted by Chrm97PI View Post
        14.5 is excessive
        My understanding is that anything under 14.8 is still OK. When it exceeds 14.8, then it’s excessive.

        Also, this testing was done just after I started the car. I would think the alternator puts out more power after initial start up to bring the battery to full charge. Is that true?

        Comment

        • squeeezer
          TCS Homer
          • May 2010
          • 972
          #5
          You got it right 14.5=ok when powering accy. To charge batt
          Go to ohms law low amps=high resistance
          nitrous fixes everything!!!!!!!

          Comment

          • TRDon
            ......because trackcar
            • Mar 2004
            • 13153
            #6
            Originally posted by squeeezer View Post
            You got it right 14.5=ok when powering accy. To charge batt
            Go to ohms law low amps=high resistance
            WAT?!
            Originally posted by Hack
            Why spend all that money just to get a worn out copy of a small block Ford? It's going to be in the junk yard for a reason. I understand you have a religion called LS motors and you have faith that the LS motors break the laws of physics and work better and cost less than anything else ever built. Plus they never wear out.

            I disagree.

            Comment

            • TwistedMetal
              Boobies.
              • May 2011
              • 3163
              #7
              Your alt should produce 13.6-13.8 volts assuming that it is properly grounded and the battery sense wire to the reg is in good condition. 14+ is too high.
              ΜΟΛΩΝ ΛΑΒΕ

              barack obama is president. You no longer need concern yourself with your own welfare. The government, as nanny state, will protect, provide and handle everything for you. All you need do is demand your "entitlements", continue to vote Democrat and watch Oprah.

              Vote democrat... because your daddy's union boss said so and millions on welfare are depending on it.

              Comment

              • FortiethStang
                TCS Regular
                • May 2012
                • 227
                #8
                13.5 to 15.5 is what is considered acceptable. You may just have a faulty dummy light. Take it to a nearby advanced auto. They'll test the alternator for free
                Sent from my Lumia 710 using Board Express

                Comment

                • Odrapnew
                  Everyone likes being blown.
                  • Aug 2003
                  • 2880
                  #9
                  I did some more searching on corral and it's possible that the single gray plug(white wire?) has a bad connection or came off. Thinking about it, I think the light came on after a hard 1-2 shift, so that wire may have popped off. I'll see if I can look into it when I get home.

                  Comment

                  • Odrapnew
                    Everyone likes being blown.
                    • Aug 2003
                    • 2880
                    #10
                    Possibly solved-See post 1 edit.

                    Comment

                    • Chrm97PI
                      268ponies with more onthe way
                      • May 2005
                      • 3413
                      #11
                      i bet it charges at 13.5 now and not 14.5 the absolute most an alternator that is working properly with a good battery is 14.1

                      Comment

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