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Blower Motor And Strange Switch.

Discussion in 'Flat Fender Tech' started by Oliver Yeates, Aug 26, 2018.

  1. Aug 26, 2018
    Oliver Yeates

    Oliver Yeates New Member

    Colorado
    Joined:
    Mar 18, 2018
    Messages:
    8
    Hey CJr's, so i'm nearing completion of my restoration project and one of the last things I need to connect is the heater blower motor. My CJ3b has a non-original (but old) system with a single wire heater blower motor (PM102: https://goo.gl/KV8Kqi) inside a heater core. I have tried to connect it from the ACC side of my ignition switch to a 10amp fuse and then to a switch which i removed from the dash when stripping the jeep months ago.

    The switch in question was originally connected to the IGN pole of the Ignition switch but it dead-ended at the switch itself... ie. the switch was never connected to anything and neither was the blower motor.



    Its my understanding that this type of blower motor is a single-speed, self-grounding motor hence there being only one terminal for a wire. however I imagined that the blower body would need grounding to the chassis/body. I connected the system up as follows. ACC > 10amp Fuse > switch > blower terminal. Ground wire from blower casing to chassis. Every time I turn the switch I blow the fuse.



    I can't find any wiring diagram for this motor online anywhere and whats more the switch I am using seems unusual to me. It has 3 terminals and is either switched up or down (on/off?) but what I don't understand is that the switch is spring loaded .i.e you can also depress the switch toggle inwards.

    I'm wondering if this switch was meant for another a different part of the jeep? wiper motor perhaps?



    There a pic of the switch here... IMG 0258 2 rsz_img_0258_2.jpg



    I also removed the switch completely (incase it was bad) and connected the blower directly to the ACC terminal via the fuse and again the fuse blew.



    I'd also love to know what the amp rating of the blower, seeing as it's quite a popular motor I'm surprised there's no wiring diagram/info online.



    Any help as always much appreciated.



    Thanks



    Oli
     
  2. Aug 26, 2018
    rusty

    rusty Well-Known Member

    norfolk,va
    Joined:
    Dec 16, 2006
    Messages:
    1,652
    I'm guessing the motor is shorted. For fun, remove ground from motor and see if fuse blows.
     
  3. Aug 26, 2018
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,102
    Just how old is the heater? i

    I your jeep 12V?

    Could it be a 6v motor?
     
    heavychevy likes this.
  4. Aug 27, 2018
    Oliver Yeates

    Oliver Yeates New Member

    Colorado
    Joined:
    Mar 18, 2018
    Messages:
    8
    Hey guys, I brought a new motor to replace the old one which was no longer working. It’s 12V and only has 1 spade connector on the back. It’s a direct copy of the old motor.

    I read somewhere that it was internally grounded so does this mean it does not need a ground wore at all?

    I tried to power it up without a ground wire figuring it was designed to ground through the motor casing and Jeep body but no luck. Just figured someone here might have experience with his type of motor?

    Here’s a link to show what type of motor it is... https://www.oscaroparts.com/vdo-hva...npQifMhvdcCyJFKlUpN_bUtfV8AmOQ1MaAidQEALw_wcB
     
  5. Aug 27, 2018
    Sierra Bum

    Sierra Bum Member

    The High Sierra
    Joined:
    Oct 23, 2017
    Messages:
    329
    Oli, that would indeed imply that it does not have a dedicated ground wire for the motor. But you can try this:
    -Before you install the motor, connect the power wire directly to the battery with a test wire that has alligator clips (if that wire has a fuse in it, that's not terrible). Connect another test wire with alligator clips to the - side of the battery, then probe around on the motor to find your ground ( you may have to sand a spot for bare metal.) Hopefully you can get your motor to run.
    --if this works you can run a dedicated wire for ground if you find reliable places to connect the ground wire.
    ---Remember you want bare metal. Paint and rust create lots of resistance to a good ground.
    ----I searched around a little and cannot find an amp rating for that motor. I have a 10 amp fuse for my heater blower. Been working fine. It's a single speed so any 25 amp toggle switch will work. Fuse the + wire going to the switch with the correct size wire.
     
    Last edited: Aug 28, 2018
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