Is it wise to use the old GM Capacitors For Judging Purposes? - NCRS Discussion Boards

Is it wise to use the old GM Capacitors For Judging Purposes?

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  • Larry E.
    Extremely Frequent Poster
    • December 1, 1989
    • 1677

    Is it wise to use the old GM Capacitors For Judging Purposes?

    Trying to find the older GM Capacitors to install in my 66 Base Coupe with Radio for Judging Purposes.
    A Typical one I found is #3861562 which is the one that is put in between the Turn Signal Flasher and
    and the connecting socket. I put an OHM meter on it and it did show some resistance vs. no resistance
    which means (A dead short) Question>Can these old capacitors break down in time and cause a dead
    short to the circuit? Since these old capacitors hardly ever work for their indented purposes(In this case
    radio static) I could unhook it internally so no one would know the difference. I would rather do this then
    blow a fuse or cause a fire. Has anybody had this problem before? Thoughts? Thanks in Advance>Larry
    Attached Files
    Larry

    LT1 in a 1LE -- One of 134
  • Keith B.
    Extremely Frequent Poster
    • September 15, 2014
    • 1582

    #2

    Comment

    • Scott P.
      Very Frequent User
      • April 30, 1992
      • 178

      #3
      Re: Is it wise to use the old GM Capacitors For Judging Purposes?

      Larry, I have a sock drawer full of radio capacitors, which ones do you still need.
      Scott Fogaley@sbcglobal.net

      Comment

      • Richard M.
        Super Moderator
        • August 31, 1988
        • 11323

        #4
        Re: Is it wise to use the old GM Capacitors For Judging Purposes?

        Larry,

        Best to use a capacitance meter to measure those. Caps, particularly old ones, typically fail open not shorted.

        For judging, proper configuration, value ID, voltage rating, is looked at, but that's it. The cap can be a electrical failure and still judge ok. It just has to be "typical".

        Now if you're doing a PV, it better be functional for each location. It's there to eliminate AM static for each configured location. I.E. Your Flasher capacitor.... Radio on, engine running. Engage directional. There should be no static "clicking" sound coincident with the flasher operating. If so, that's a PV fail. Same goes for others: ACC Cap rear of cluster, Heater blower cap at blower motor, Brake pedal switch cap under pedal box, Park Brake cap, Red LIGHTS filter cap top rear of cluster(flashes the #257 bulb when lights on but buckets not fully raised), etc. All shown in UPC U69.

        Rich

        Comment

        • Larry E.
          Extremely Frequent Poster
          • December 1, 1989
          • 1677

          #5
          Re: Is it wise to use the old GM Capacitors For Judging Purposes?

          Thanks for the replies; now>

          Keith>I do plan on using the one I found for judging. BTW>The picture I posted IS NOT THE one I HAVE.(Picture shows the
          Capacitor in question). The one I have is an actual one that was on a Corvette which means it is 50 going on 60 years
          old! The one I have looks very similar to the one shown in the newest 66 Judging Manual.

          Scott>Thanks for the offer; think I got them all but not all are installed yet.

          Rich>Good to know they typically fail open not shorted. I doubt if the judges could even read the ratings on this one as
          it is very old but it is original to the 66 Corvette with a radio.. Do not plan on being judged in PV.

          Will try it out but still concerned if it would ever "short out". I assume the flasher circuit has a fuse unlike the cigarette
          lighter that does not.

          Any other comments on this subject will be welcomed. Larry
          Last edited by Larry E.; September 18, 2022, 06:18 AM.
          Larry

          LT1 in a 1LE -- One of 134

          Comment

          • Larry E.
            Extremely Frequent Poster
            • December 1, 1989
            • 1677

            #6
            Re: Is it wise to use the old GM Capacitors For Judging Purposes?

            Thought I would move this up for one last try to see if anybody ever had a problem with a "shorted out".
            Capacitor. If not I will use as is. When one googles the question the majority answers as I understand
            it is that when a Capacitor fails it more then likely cause an "open" vs. "short" condition in the circuit.(Just Like Richard indicated)
            They also indicate it depends what the Capacitor is made of. eg>ceramic/mica/paper and etc. I have
            no idea what the #3861562 is made of but it is very old. Thanks Again>Larry
            Larry

            LT1 in a 1LE -- One of 134

            Comment

            • Frederick H.
              Very Frequent User
              • August 31, 1983
              • 440

              #7
              Re: Is it wise to use the old GM Capacitors For Judging Purposes?

              Richard, I just replaced the capacitor by the coil with a repro (as the wire on the original one broke loose), but still getting clicking static when using the turn signal and pressing the brake pedal. Sounds like I need to check the rest of them.
              Fred

              Comment

              • Frederick H.
                Very Frequent User
                • August 31, 1983
                • 440

                #8
                Re: Is it wise to use the old GM Capacitors For Judging Purposes?

                Scott, I could use a couple of capacitors for my '63 given the clicking static when I use the turn signal or press the brake pedal. Will chech the numbers and let you know.

                Thanks,
                Fred

                Comment

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