Variable Speed Wiper Motor Woes (1964 Valiant)

Electrical and Ignition

  1. armyofchuckness

    armyofchuckness The Flying Valiant

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    I have the variable speed wiper setup in my 1964 Valiant. I tried wiring it up last night and it immediately popped two ten amp fuses back to back in my new wiring harness (Ron Francis). I put a 30 amp fuse in just to see what would happen. It didn't blow. The wipers made a brief noise and stopped. If I pushed on the wiper motor, I could hear the motor whine like it was trying to move, but it didn't do anything. The wiper motor and switch are original to the car and worked when I took it off the road. Here's the only thing I've done with them since I took it off the road to restore it five years ago:

    Both switch and motor were sprayed with electronics cleaner.
    I added a ground wire to the outside lip of the switch casing by securing a ring terminal to it with a hose clamp and running it to a grounding bus I have under the dash.
    I ran a wire from the grounding bolt of the motor and ran it to the same grounding bus.

    Here's what I was experiencing with my test light:
    Power was going into the switch. (Pink wire)
    Power was coming out of the switch through the red wire running to Field 1.
    No power through the yellow wire going to field two. (I assume that's because Field 2 is for the return motion.)
    Power through the wire connected to the "armature" connection when the switch was on.
    Power going to the "park" wire when the switch was off.

    So it would seem the switch is working ok. I think it may be the motor that's acting up. Any suggestions on servicing or repairing it? I didn't see much when I searched the forums. Thanks!
     
  2. RedFish

    RedFish Well-Known Member

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    have you attached the wiper linkage to the motor? If yes and its 180 degrees wrong, the blades will try to go down across the hood rather than up across the glass. Just a wild guess
     
  3. armyofchuckness

    armyofchuckness The Flying Valiant

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    Good idea! I don't have any wipers on the car though, and I've put it back I've also tried the motor without the armature attached and it seems to be doing the same thing. Hmm.
     
  4. KitCarlson

    KitCarlson Well-Known Member

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    Wiper motors and controls vary. Motors have armature (rotor) and stator (field) windings. There needs to field current, for the motor to run, or the armature current will go skyhigh,and blow fuses.
    The variable resistor often controls the field for speed control, but less current is more speed. Best to consult field service manual. I am using phone so my ability to see is very limited, or I would search.
     
    • Thanks! Thanks! x 1
    • armyofchuckness

      armyofchuckness The Flying Valiant

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      Good info, Kit. I'll check on my FSM tonight. Thanks so much!
       
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