1967 Horn Relay Fusible Link Question - NCRS Discussion Boards

1967 Horn Relay Fusible Link Question

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  • Paul L.
    Expired
    • November 1, 2002
    • 1414

    1967 Horn Relay Fusible Link Question

    The pic shows the horn relay in my 1967. That blackish wire with the small rubber cylinder is the fusible link I believe. The car is running well but that wire is showing its age. Its insulation is spongy and somewhat loose. The others look just fine. To ward off a possible failure and to freshen up that connection I wish to replace that wire.

    Looking at the wiring diagram I see that power lead (red) is 10 gauge and the fusible link is 12 gauge. That makes sense according to the reading I have done. (The link should be two sizes smaller although I am unclear as to whether "two" means 12 or 14 for a 10-gauge power wire since the wire sizes are in increments of 2.) So off to the local GM dealer to get a short length of link replacement. The parts fellow tells me that wiring is still sold in XX gauge but links are now sold in mm. He doesn't know what a 12 gauge translates to in mm. Can someone help me with this? Are these links color-coded as to size to make matters simpler?




  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: 1967 Horn Relay Fusible Link Question

    Paul -

    You need a 14-ga. fusible link to protect a 10-ga. wire, or a 16-ga. link to protect a 12-ga. wire (always 4 numbers/two wire sizes difference). 14-ga. is 2.0 mm2, 16-ga. is 1.0 mm2.




    Attached Files

    Comment

    • Paul L.
      Expired
      • November 1, 2002
      • 1414

      #3
      Re: 1967 Horn Relay Fusible Link Question

      Thanks John. GM has the 2mm. I will get a length tomorrow. What is the purpose of that rubber cylinder? Do I cut before it or after?

      Comment

      • William C.
        NCRS Past President
        • May 31, 1975
        • 6037

        #4
        Re: 1967 Horn Relay Fusible Link Question

        The rubber cylinder covers the splice tha mated the fusible link to the main wire. Well done heatshrink will work as well.
        Bill Clupper #618

        Comment

        • Paul L.
          Expired
          • November 1, 2002
          • 1414

          #5
          Re: 1967 Horn Relay Fusible Link Question

          It has been suggested that the relay is upside down. Any comments?

          Comment

          • Stephen L.
            Extremely Frequent Poster
            • May 31, 1984
            • 3148

            #6
            Re: 1967 Horn Relay Fusible Link Question

            Its upside down. CAN cover should be up

            Comment

            • Paul L.
              Expired
              • November 1, 2002
              • 1414

              #7
              Re: 1967 Horn Relay Fusible Link Question

              Steve,
              I can't turn the ground location left to right. What is wrong here?




              Comment

              • William C.
                NCRS Past President
                • May 31, 1975
                • 6037

                #8
                Re: 1967 Horn Relay Fusible Link Question

                Appears to be a non-original relay, I don't understand the "can't turn" question.
                Bill Clupper #618

                Comment

                • Stephen L.
                  Extremely Frequent Poster
                  • May 31, 1984
                  • 3148

                  #9
                  Re: 1967 Horn Relay Fusible Link Question

                  There should be 2 holes in the radiator support in this area. The outboard hole should have the bolt it it with the bracket and ground wire under it. The inboard hole is for the alignment tang on the horn relay bracket. It appears that the bolt is in the wrong hole.

                  Comment

                  • Stephen L.
                    Extremely Frequent Poster
                    • May 31, 1984
                    • 3148

                    #10
                    Re: 1967 Horn Relay Fusible Link Question

                    There is a good drawing of the horn relay on page UPC12-A7 in the AIM if you have one......

                    Comment

                    • Paul L.
                      Expired
                      • November 1, 2002
                      • 1414

                      #11
                      Re: 1967 Horn Relay Fusible Link Question

                      Bill,
                      "Can't turn." The relay (upside down I have learned) is bolted into the front bulkhead on the right side by a grounding bolt and cable. The left side is secured by a notch in the relay. They are not inchangerable. I will post a pic.

                      Comment

                      • Paul L.
                        Expired
                        • November 1, 2002
                        • 1414

                        #12
                        Pic

                        You cannot change the ground and the locating tab left to right. Something wrong here.

                        Comment

                        • Gerard F.
                          Extremely Frequent Poster
                          • June 30, 2004
                          • 3803

                          #13
                          Should look like this

                          Paul,

                          Original 67 smallblock position, after refinish.

                          But your chassis looks a lot cleaner then mine.

                          Just one step at a time.

                          Jerry Fuccillo
                          #42179
                          Attached Files
                          Jerry Fuccillo
                          1967 327/300 Convertible since 1968

                          Comment

                          • Paul L.
                            Expired
                            • November 1, 2002
                            • 1414

                            #14
                            Wire Gauge to Metric Conversion

                            Thanks Jerry. This afternoon I will be trying to figure out why my mounting bolt hole is in the wrong place.

                            I stumbled upon this wire gauge to metric (mm) conversion table.

                            Comment

                            • Paul L.
                              Expired
                              • November 1, 2002
                              • 1414

                              #15
                              Well I was Wrong...Blush

                              I installed the Echlin HR135 today. The left-hand (proper) ground mounting hole was a bit tight but the self-tapping bolt bit very nicely. I also replaced the very weathered fusible link wire with a new 2mm (14 gauge)length from GM with shrink wrap. So the horn relay is now rightside-up. I don't know why I never noticed that it was upside down before??

                              I ran the car for 10 minutes and did not need the fire extinguisher. The ammeter shows just a wee bit positive as is normal. In any case, things seemed to have worked out OK. Thanks for your help!




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