Three speed motor and two speed switch will give you one speed only, hyperspeed, and the motor will only "park" where you shut it off at, it will not park properly. Same samey if you have a two speed motor and a three speed switch. The motors build the same, what determines if they are three speed or variable is the switch itself. If I take a motor and put it on my bench, it's three speed because I have a three speed switch mounted to my bench, if I move it across the shop to another bench it will be variable because I have a variable speed switch on that bench. I wire my switch with the correct color wires and terminal connectors that slide onto the spades on the switch.
Wiring is the same on a car whether it's a two speed or a three speed because when they were coming down the line who knows what they were going to have, no wiring changes have to be done to go from two speed to three speed, car should be equipped to handle either.
On my site I have a white sheet that Jim at JSRestorations prepared for me on how to wire and test switches since he restores switches who better to get the info from? I think also I have a diagram of the color to what spade on my site, upper right hand area blog/knowledge base. I post as much info there on mopars as I can get time to root through and upload.
FYI: You'll need to also replace the crank arm when you're converting from a two speed to a three speed/variable speed motor. Two speed motors were concentric motors and three speed/variable speed motors were non concentric. The bends and angles of the opening for the output shaft are different because the motors operated differently. It's entire possible to put the motor in a bind because the linkage binds if you have a three speed motor and a two speed crank arm. You also can't use a two speed bushing on a three speed crank arm....I know, it's crazy, but it is the way Chrysler designed things and I'd hate to see someone go through all this trouble to overheat a motor because someone didn't say hey, don't do this or this.
When you're doing a two to three speed conversion on an E body you also have to replace the drive link where on a B body you don't have to replace the drive link.
http://passion4mopars.com/Mopar-2-Speed-to-3-Speed-Mopar-Wiper-Motor-Conversion_b_1.htmlhttp://passion4mopars.com/Testing-and-Wiring-a-3-Speed-Switch_b_46.htmlhttp://passion4mopars.com/Wiper-Motor-Wiring-Diagram_b_6.htmlhttp://passion4mopars.com/Mopar-E-Body-Variable-Speed-Wiper-Switch-Wiring_b_39.htmlHope some of my info helped with your endeavor. If you have any questions hit me up by email, that's the easiest way to contact me. I'm a one gal show over here and I'm like a fart in the wind most days...I'm in the back soaking, over at the other shop blasting, back over here acid dipping, might be at the bench, might be away from the bench, might be mid solder or mid cussing spree and can't get to the phone before four rings. Wish it were different and I was always able to answer, but sometimes I can't get there from where I am :-)
