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Up until the 1960s, most automobile windshield wipers were powered by vacuum motors.  I have a 51 Willys pickup with a vac motor.  The last time I registered the truck, the only way I could get the wipers to pass the inspection was to mist the windshield with a water spray bottle before turning them on.  It is time to reregister the truck and the wiper motor has failed. 

This Instructable describes the process I used to convert the wipers from the original vacuum motor to a 12 volt motor.  If you choose to make this conversion,  I suggest you read through all of the steps before starting.  These instructions are a little disjointed.

Step 1: Know what you need to replace

This is my vacuum motor.  There are several sizes of these motors.  To make the replacement, you will need to duplicate the motor drive hub and mounting holes pattern of your own motor.
<p>Thanks for sharing such a simple procedure that helps to save a great load of inconvenience! This is the common problem we all have to face when dealing with a classic. You have to constantly be innovative to find out cheaper alternatives to solve daily problems.</p>
<p>Just finished this and it works. A couple of notes: The white wire needs to be switched off when not using the wipers because it always carries current. Use a DPDT center-off switch instead of the SPDT he used. Use the second pole to turn on the 12V to the white wire when in either the left or right switch position. Second note, mine also parked in the up position instead of the down. I suspect that on a Willys, you may be able to cross the cable wires under the dash to reverse the action and end up parked in the down position. Other than that, great instructions Grandpajoe. Signed Grandpa Gabe</p>
You did a fantastic job! I'll second the photo request, I love classic trucks! By the way, did she pass inspection?
Please post a pic of your car, would love to see it.
Good to know for anyone with a classic car!

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Bio: My wife and I are the proud parents of 6 wonderful children who are now married and raising families of their own. I am a ... More »
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