Heater switch question

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  • ocsddep
    Low Range
    • May 2012
    • 48
    #1

    Heater switch question

    I just replaced the heater blower switch in my 67. It is supposed to be a 2 speed switch. I wired it the same as the old one, which I think may have been wired wrong to begin with. I am only getting 1 speed (guessing high) with both switch positions.

    The switch has 3 wires going into it. One is always hot. The switch when looked at vertically, has 2 tabs on the bottom, 1 tab on the top and 2 tabs in the middle. The hot wire is going into the middle tab, the second wire into the other middle tab and the 3rd wire into the top singular tab. The 2 tabs side by side on the bottom are not being used.

    Does anyone have a picture of how it is supposed to be wired so I can get 2 speeds out of my fan motor?

    Thanks,

    Ray
    Ray

    04 Jeep Wrangler Rubicon
    67 IIA 109 (Found a new home in Russia)
    74 Porsche 914/2.0
    68 Cadillac Coupe Deville


    69 IIA 88 (Sold)
    67 XK-E 2+2 (Sold)
    67 Mini Cooper S (Sold)
    74 MG B-GT (Sold)
    76 Alfa Spider (Good riddance)
    85 Ferrari 308 GTS QV (Sold)
    96 & 02 H1 Hummers (Missed)
    Tags: None
    • siiirhd88
      3rd Gear
      • Oct 2006
      • 369
      #2
      The wiring diagram shows power into the switch on terminal #4 and power out on terminals #6 and #8. The terminals are numbered on the rear of the switch, with #1 at the top left and #2 at the top right, #7 on the bottom left and #8 on the bottom right.. A continuity test on my switch verified that #4 has continuity with #6 at the frst toggle position (slow) and with #8 at the second toggle position (fast). Terminal #1 has continuity with #4 on both switch toggle positions. With your switch wired with one outgoing wire on #1 it will have power to the fan in either toggle position...... and if the fast speed wire the fan will run in high in both toggle positions.

      You could try moving the wires to the terminals as written, or do a continuity test on your switch in the event your switch had different contacts.

      The typical two speed Series heater fan has a resistor mounted at the fan to reduce the voltage for slow fan speed. This resistor can burn out which usualy causes an 'open' and a loss of fan slow speed.

      Bob
      '02 D2 SE Kalahari
      '02 D2 SD
      '97 RR HSE Vitesse
      '80 SIII 109
      '75 SIII 88 V8
      '68 IIA 109 V8

        Comment

        • ocsddep
          Low Range
          • May 2012
          • 48
          #3
          I think you hit the nail on the head. I will check the resistor. This was very helpful. Thank you.
          Ray

          04 Jeep Wrangler Rubicon
          67 IIA 109 (Found a new home in Russia)
          74 Porsche 914/2.0
          68 Cadillac Coupe Deville


          69 IIA 88 (Sold)
          67 XK-E 2+2 (Sold)
          67 Mini Cooper S (Sold)
          74 MG B-GT (Sold)
          76 Alfa Spider (Good riddance)
          85 Ferrari 308 GTS QV (Sold)
          96 & 02 H1 Hummers (Missed)

            Comment

            • pjsank
              Low Range
              • Dec 2006
              • 77
              #4
              If it is the resistor, here is a link for a replacement two ohm resistor.

              The resistor wire on mine crumbled this spring. It left me with only high speed on the high position. No fan on the low.

                Comment

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