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E-body 2-speed to 3-speed wiper conversion #2020585
02/27/16 03:21 AM
02/27/16 03:21 AM
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340clone Offline OP
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I'm planning to convert from a 2 to 3 speed wiper motor in my '71 Challenger. I have a set of later model ('74)B-body 3-speed linkage which has the exact same shape as my old 2-speed linkage so it seems like it will work. (Someone please tell me if it wont)I also have a 3-speed motor, crank arm, etc. from the same '74 B-body.

I think I have everything I will need except the 3-speed wiper switch, and the associated wiring. The 3-speed motor plugs right into the firewall harness, but what will I need for the dash harness that the switch plugs into? Is there a way to wire it up to the switch (relatively easily) without replacing the harness. Are there any harness (conversion)kits available?

Thanks so much!

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020641
02/27/16 11:13 AM
02/27/16 11:13 AM
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My "guess" is that the wiring is already in the harness. Pull the plug off the existing switch and have a look. Likewise at the firewall.

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020679
02/27/16 12:30 PM
02/27/16 12:30 PM
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Hi 340 clone, your B body set up will work although 71 E body as the flat switch plate on there wiper motor compare to the big plastic cover on 72 and later model As you said you will need the switch ( 3 speed/variable ) unless I am mistaken dash wiring is the same. I will try to get you the part number for the switch.

Stephan

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020683
02/27/16 12:39 PM
02/27/16 12:39 PM
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1970A66 Offline
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This says the harness is the same for 2 to 3 speed:

https://board.moparts.org/ubbthreads/ubbt...ch-harness.html

Different switch connector plug of course. You can remove the terminals from the connector and then wire it up.

Linkage info:

http://www.passion4mopars.com/Mopar-2-Speed-to-3-Speed-Mopar-Wiper-Motor-Conversion_b_1.html

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020686
02/27/16 12:42 PM
02/27/16 12:42 PM
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Are you installing a 3 speed motor/switch or the variable motor/switch usually found on 70-71 e bodies?

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020693
02/27/16 12:56 PM
02/27/16 12:56 PM
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here's how to wire up the #3488380 3 speed/variable switch:

https://board.moparts.org/ubbthreads/ubbt...allye-dash.html

Last edited by 1970A66; 02/27/16 12:58 PM.
Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020894
02/27/16 08:20 PM
02/27/16 08:20 PM
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Wow! This is great stuff! I was able to get my hands on an E-body 3-speed wiper switch and a harness out of a 3-speed wiper car that I can rob the plug off of. Now off to buy a lottery ticket! smile

So if I am reading this right, all I have to do is remove the spade connectors from the two plugs from my 2-speed harness and re-insert in the one-piece (3-speed) plug using the diagram in the link? Is that correct?

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2020929
02/27/16 09:22 PM
02/27/16 09:22 PM
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You must use a variable switch. 70-71 cuda is #2770380 If you use a 3-speed switch you can't hook up the red and green wire without smoking it. It will only run 1 speed with the wires not hooked up. The 72-74 is the wrong switch. It's easy to tell because it has a silver square on the side of the switch with wires coming out of it.

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2021406
02/28/16 05:09 PM
02/28/16 05:09 PM
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OK, now I'm a little confused.

So should I hook up the 2-speed harness to the 3-speed switch? If so, should I use the two separate plugs (two and four prong) from the 2-speed harness, or re-set the wires from the 2-speed harness into the 3-speed plug (6 prong).

What would happen if I installed the 3-speed wiper motor and just kept the 2-speed switch. Or instead, added the 3-speed switch and just left off the red and green wire. (If I plug the 4-prong plug from the original 3-speed harness, that will eliminate the red and green wires)

Finally, if I can get my hands on a variable switch, that would work properly with re-setting all of the wires into the 3-speed plug?

BTW, the 3-speed switch I have is 3488764. There are three clicks so I don't think it's variable.

All help appreciated!

Last edited by 340clone; 02/28/16 05:48 PM.
Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2021421
02/28/16 05:48 PM
02/28/16 05:48 PM
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A variable speed switch should have a thumbwheel or knob ... some way to adjust the variable speed. A two or three speed switch would only have two or three fixed positions.

Personally I'd just follow the applicable wiring diagram for whatever you want to do.

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2021469
02/28/16 08:10 PM
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I'd like for it to work as original (3-speed) but if I have to settle for it only working on one speed that would be OK. I'm just trying to figure out how all of the different wiring scenarios work out...

Last edited by 340clone; 02/28/16 08:11 PM.
Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2021545
02/28/16 10:42 PM
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Read this:

http://www.passion4mopars.com/Are-All-3-Speed-Crank-Arms-the-Same-_b_48.html

I really think you need to call Kim and ask her about your setup.
Have the part numbers in hand when you call, for the motor, switch, crank arm and linkages.
She is very helpful and great to talk to.

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2021670
02/29/16 02:24 AM
02/29/16 02:24 AM
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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.html

http://passion4mopars.com/Testing-and-Wiring-a-3-Speed-Switch_b_46.html

http://passion4mopars.com/Wiper-Motor-Wiring-Diagram_b_6.html

http://passion4mopars.com/Mopar-E-Body-Variable-Speed-Wiper-Switch-Wiring_b_39.html

Hope 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 :-)

Last edited by p4m; 02/29/16 02:26 AM.
Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2021909
02/29/16 03:40 PM
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When I bought my 70 cuda it came with the 3-speed switch instead of the variable switch and would only run on fast and not park correct as Kim stated. I looked and the two wire plug (red & green) wasn't hooked up. The minute I put it on the switch it started smoking. I talked to Jim at JS restorations and he said you need the variable switch to work correct and those wires with that switch causes a dead short. There are a couple of the correct 70-71 switches on e-bay. Good luck, Mike

Last edited by second 70; 02/29/16 03:41 PM.
Re: E-body 2-speed to 3-speed wiper conversion [Re: second 70] #2021982
02/29/16 05:51 PM
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Originally Posted By second 70
When I bought my 70 cuda it came with the 3-speed switch instead of the variable switch and would only run on fast and not park correct as Kim stated. I looked and the two wire plug (red & green) wasn't hooked up. The minute I put it on the switch it started smoking. I talked to Jim at JS restorations and he said you need the variable switch to work correct and those wires with that switch causes a dead short. There are a couple of the correct 70-71 switches on e-bay. Good luck, Mike


I think that's the ticket! I believe I have all of the mechanical parts together, but I will need the variable switch to make it work right. I will just have to pony up for the right switch!

So with the variable switch, were you still able to use the 2-speed wiring harness and plugs?

Thanks!

Brian

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2022181
02/29/16 10:51 PM
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yes the harness works for 2 speed or variable switch.

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2025516
03/06/16 03:45 AM
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I think I finally have this sorted out. As I mentioned before, I have a complete set of '74 3-speed wipers from a B-body. (These will work on an E-body, right?) I am assuming this is the first year for the plastic bushings. This seems like a good thing because I can still get replacement bushings at the local parts stores if needed. I have a working 3-speed motor from a '74 as well, and it's all wired up and ready to go. Harness is good to go. Just ordered the proper variable switch tonight, so I that's all I am waiting on. Should be here in a few days.

Am I missing anything else?

Last edited by 340clone; 03/06/16 03:46 AM.
Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2025836
03/06/16 06:06 PM
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I think the drive arm on the b-body is longer you may need one from a 72-74 e-body P/N 3431514

Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2025984
03/06/16 09:16 PM
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Originally Posted By 340clone


Am I missing anything else?




Depending on the wiper motor your using, you may need to "re-clock" it to park properly, note bottom pic for clocking-tit located on transmission faceplate, the 7 digit numbers on the left hand side of the upper pic/print are the part numbers of various 3 spd motors and their approx parking index location

motorclockingwiper.JPGclockingtit.JPG
Re: E-body 2-speed to 3-speed wiper conversion [Re: 340clone] #2027695
03/09/16 02:57 AM
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I checked the park position on the motor and I am good there.

In searching for P/N 3431514, all I can find are the drive arms with the metal clip-type bushings. I am thinking those ended in '73. The wiper arm set up I have has the polyurethane bushings that I believe started in '74. The drive arm that I have is P/N 3431647 that did come off of a '74 B-body. So if the latter part number will not work, is there an E-body drive arm counterpart from '74 that uses the poly bushings?

Thanks for all of the info!

Brian

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