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Heater Blower Motor

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  • Heater Blower Motor

    No power to the blower motor switch in my 1986 J20

    All fuses good, any ideas?

  • #2
    There is a relay buried in circuit on '86-up could be culprit? has wiring diagrams if needed
    88 GW, 67 J3000, 07 Magnum SRT8


    • #3
      I found one relay under the switch in easy reach and swapped a good one I had here and no power.

      Not sure if that was the correct one it was the low hanging fruit I had easy access to

      I will look for others under the dash


      • #4
        That relay looks like the correct one based on wire colors and there is no power to that relay

        Is there a fusible link wire in that circuit?


        • #5
          It would be on the wiring diagram.

          Looks like a thermal fuse on the resistor stack. Seems more likely. Use your multimeter to test. Don't flail, read the diagram and measure.
          Last edited by tgreese; 08-19-2019, 09:38 AM.
          Tim Reese
          Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
          Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
          Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
          GTI without the badges: '95 VW Golf Sport 2000cc 2D
          ECO Green: '15 FCA Jeep Cherokee KL Trailhawk


          • #6
            It was the fuse on the thermal relay. I fixed it yesterday.

            Thank you for the replies.