wiper motor question?
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Laughing Gas
Joined: Jun 2007
Posts: 815
Likes: 29
From: Richland, WA.
wiper motor question?
My 54 still has the original 6v+ ground wiper and heater motor. My quetion is will these work with 12-ground? I imagine the motors may turn backwards but I am afraid to connect power to them. frayed cloth wires and age. they may not even work I dont know. PS the person who did the conversion used a volt-a-drop I want 12 volt neg ground for all. Any info or ideas would be great, thanks. Kurt Y-blocks rule!!! 
Lead Driver
Joined: Oct 1999
Posts: 6,772
Likes: 552
From: Kalispell, MT
You want to use the voltage regulator (volt-a-drop) or you'll burn up the 6V accessories with 12V current.
Your heater has two wires - if your fan runs backward, switch power to the other wire. Replace any frayed sections or tape/insulate securely.
I'm not familiar with the wipers on a '54 but if they're electric the same applies re: voltage regulator - my 48 still has vac wipers.
Your heater has two wires - if your fan runs backward, switch power to the other wire. Replace any frayed sections or tape/insulate securely.
I'm not familiar with the wipers on a '54 but if they're electric the same applies re: voltage regulator - my 48 still has vac wipers.
Senior User
Joined: Aug 2001
Posts: 126
Likes: 1
From: Northwest
I asked the same question about the rotation of the fan motor as well as the starter when I went from positive to negative ground in my '49 F1. (I still have a vacuum wiper.) It turns out these motors aren't permanent magnet motors, but are wired with a series field. If you change the polarity of the power going to them, you change it for the field AND the armature and the motor will turn the same direction. I assume you're wiper is the same, but if it turns the wrong way would you even know or care?
I installed a volt-a-drop which is no more than a ballast resistor to limit the current through whatever circuit it is hooked to. If it has the same resistance as your fan motor, the motor will see 6 volts. The problem is your wiper motor will probably pull less current and would see a higher voltage except on those cold and rainy days when both would see less. I doubt you'd have any problems at all with this set-up.
Be careful, the resistor will get hot. Tape up all frayed wires, they can cause fires.
Good luck,
Johann
I installed a volt-a-drop which is no more than a ballast resistor to limit the current through whatever circuit it is hooked to. If it has the same resistance as your fan motor, the motor will see 6 volts. The problem is your wiper motor will probably pull less current and would see a higher voltage except on those cold and rainy days when both would see less. I doubt you'd have any problems at all with this set-up.
Be careful, the resistor will get hot. Tape up all frayed wires, they can cause fires.
Good luck,
Johann
