Intermittent wipers - anyone done a conversion?
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
This post goes back to 2003. Since then I have done a few of these conversions and it is one of the best available for our old Fords. The OEM Bosch two speed wiper systems on some of these old trucks are problematic and I would not convert these on a driver. The bell crank on the Bosch motors does not work on the later model (4 wire motors) and you still have that 40 year old switch to contend with. Since I did my first conversion I wrote a tech article and it is posted here. Carpenter sells a new button with allen screw mount. After that you will need a 4 wire motor, variable regulator, the big switch with ground wire and the bell crank off a single speed wiper motor of 61-66 vintage. Start to finish is about 3 hours. Read the tech articles here on FTE and have at it!
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
This post goes back to 2003. Since then I have done a few of these conversions and it is one of the best available for our old Fords. The OEM Bosch two speed wiper systems on some of these old trucks are problematic and I would not convert these on a driver. The bell crank on the Bosch motors does not work on the later model (4 wire motors) and you still have that 40 year old switch to contend with. Since I did my first conversion I wrote a tech article and it is posted here. Carpenter sells a new button with allen screw mount. After that you will need a 4 wire motor, variable regulator, the big switch with ground wire and the bell crank off a single speed wiper motor of 61-66 vintage. Start to finish is about 3 hours. Read the tech articles here on FTE and have at it!
Freshman User
Joined: Feb 2005
Posts: 44
Likes: 0
From: Lynnwood, WA
Good subject. I am also in the NW where, as haas been said, a wiper delay is almost a necessity. I have a 66 with 2 speed wipers and am a little confused about what I really need to do. On one post, it was said that if you have 2 speed wipers all you need in the switch and control box. HOwever, somebody else said you need a new motor. Maybe the key is the number of wires from the motor. I believe that I have 3 wires. So what is the correct answer? Any help would be aappreciated.
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
It depends on what way to want to do this.
1. Using your original motor and wiring harness will require a lot of cutting and splicing wires. The wiring harnesses between the early and late generations are not the same, and are not even close to compatible. The plugs are different, the switches have different plug-ins, and the wires are not even color coded the same.
2. Using a complete transplant (motor, switch, delay module and wiring harness) from a '70s truck will require only slight modifications. It is almost bolt up.
In this case, you need to only splice the positive power supply for the system into the truck's wiring. I went through a fuse on the fuse box. Using the added plug and wires for the later switch to activate the squirts is a nice feature too.
The other issues are mechanical. You unplug the existing wiring harness from the existing motor and wire it up out of the way, replace the '66 motor with the later one (into the '66 bracket), install the '66 bell crank on the later motor, plug in the late wiring harnesses, replace the existing switch with the later one, shorten the switch rod, and you are pretty much done.
Does this help?
1. Using your original motor and wiring harness will require a lot of cutting and splicing wires. The wiring harnesses between the early and late generations are not the same, and are not even close to compatible. The plugs are different, the switches have different plug-ins, and the wires are not even color coded the same.
2. Using a complete transplant (motor, switch, delay module and wiring harness) from a '70s truck will require only slight modifications. It is almost bolt up.
In this case, you need to only splice the positive power supply for the system into the truck's wiring. I went through a fuse on the fuse box. Using the added plug and wires for the later switch to activate the squirts is a nice feature too.
The other issues are mechanical. You unplug the existing wiring harness from the existing motor and wire it up out of the way, replace the '66 motor with the later one (into the '66 bracket), install the '66 bell crank on the later motor, plug in the late wiring harnesses, replace the existing switch with the later one, shorten the switch rod, and you are pretty much done.
Does this help?
Last edited by banjopicker66; Apr 20, 2005 at 12:06 PM.
Logistics Pro
Joined: Feb 2000
Posts: 3,565
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From: Sun River St. George
One more important point! The bell crank on the 61-66 Bosch American two speed wiper motors is different than the one on the single speed motors. You will need a bell crank from a 61-66 single speed motor. BP lays it out clearly and after having done several of these conversions his complete transplant option is the way to go. People that are doing an original restoration will buy those two speed systems especially if you have one that is complete. The complete transplant option gets you into easily available later model replacement switches, regulators and remanufactured motors. Reliability is paramount on a daily driver.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Guys, It has been 5 years since I did this, but I think I disconnected the power wire & ground from it's source and moved everything as a complete unit. I can't remember if I had to use the mount for the motor from the 66 or the 76 donor, but I'm thinking 66. I do recall having to use the arm off the motor from the 66 to get it to park correctly.
I don't fully understand what William is saying. He might be doing it differently from the way I did it. No problems with it, since I installed it.
John
I don't fully understand what William is saying. He might be doing it differently from the way I did it. No problems with it, since I installed it.
John
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
I would add to BP's comments that the bell crank for the 61-66 two speed Bosch American system will not work on the later four wire motors. You will need a single speed 61-66 bell crank. A complete transplant with later model components and a new **** with an allen screw retainer from Dennis Carpenter is the best way to do this. This gets you into late model parts availability and remanufactured motors. Add a relay to run the washer pump and you have everything on one switch.
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Logistics Pro
Joined: Feb 2000
Posts: 3,565
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From: Sun River St. George
I apologize fellows, I am having issues with my computer double posting and then not showing all the earlier posts. To answer the motor/firewall mount. You will use the 61-66 mount with the later model motor. This is a drop in deal, no new holes, wires or mounts. The only modification is to the later model switch. The shaft has to be shortened and the flat extended towards the switch. This allows the new allen screw mounted **** to slide on. I suppose if youre careful you could make the flat nice enough the use the original ****. My First post on this issue was in 2003. Since then I have done several of these conversions and even sold a few “Conversion kits” for those that did not want to root around in the Junk Yard.
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