Ok, I have an 88 E-150 Extended Cargo Van.
The wipers started acting goofy, seemed like a switch problem, I do not have Intermittent Wipers, just Off/Low/High. They ended up not working on Low and worked on High only. Then they would only work if you got the switch between Low and High. I replaced the switch as it seemed like the problem and was the fastest and cheapest fix. Did not change a thing. Now they do not work at all.. My mechanic said it heeds a Governor but I cannot find the Governor. I did however notice the wiper motor has a 3 wire plug on the bottom and a 3 wire plug at the top of the motor. Is that maybe the Governor as part of the motor?? Everything I come up in searches goes to F-150 and does not help at all. Someone has to have an idea here???

 

I don't think standard wipers have a governor. According to my manual the governor is only used with interval wipers.

There are two different wiper switches.. Motorcraft D3AZ-17A553-C or equivalent after market switch for non intermittent wipers.
Wiper motor: Motorcraft D9UZ-17508-A or E3PZ-17508-A.... CARDONE 40-288

If I am understanding my manual and diagrams correctly:
The standard wiper motor has two sets of brushes, one for high speed and the other for low speed.

You could have a ground problem???

The two electrical connectors:
Connector #1
Motor connector:
Yellow=common.
White/Orange=high speed.
Blue = Low speed.
When the switch is in the off position, the blue is grounded so the wipers will park.
-
Connector #2
Wiper park switch built in motor.
BK/White
Red
Green
-
For the motor, the common "yellow" is 12volts and has power when the switch is in low or high speed.
They are switching the grounds for high "white/orange and Low "blue"

For the park connector: Green is direct 12volts and is not switched.
Black/white is a unswitched ground
Red is a switched ground

 

​​​​​​Thank You for your Help. I found a Wiper Motor so I am going to order it, but in the meantime I am going to be checking my Grounds and or running an Auxiliary Ground for Testing Purposes. I wasn't sure if Standard Wipers had a Governor or not.. Got me some vision to look at it tonight with. Thank You Again, I'll let you know the outcome.

 

You are welcome and it helped me too! Last year I was at a junk yard and acquired the governor and switch. I was thinking to swap mine over but see now that takes a different harness.

I do not have the part numbers but while you are in there changing the motor, you might want to think about changing the wiper linkage bushings. I haven't looked up the bushing part numbers yet but my 1988 e150 is starting to make some noise after the wipers run for a while and so I am going to check those.. That Morotcraft motor is not cheep

 

Does anyone know if you can hook up the intermittent switch from a later model van (say 88 model to a 77 model) and will the intermittent work?

 

The diagram for my 1988 shows different wiring. i would guess it is a different harness. The wiper switches and connectors that go into the back of the switch are different also.

It is not just simply a time delay because the wipers have to park in the down position during pause.

I am sure it could be done but would require some changes...

 

Thanks for that Annaleigh

 

actually on at least the 1988 vans I believe the wiring can all be done inside the van at the switch part of the harness. It would require a governor/relay and intermittent switch. The governor/relay might be very hard to find. Someone good with electronics could probably build one. Also the bezel is different as one has intermittent or delay on it.. I think it's INT.
The parts I got at the junk yard so change mine has the has the governor and bezel but the bezel is wood grain and my 88 is black.

It would require several splices. I think the motors are the same

 

I went to the junk yard when I was over there (US)last year i cut out the switch and there was a small box attached to it and a heap of the harness as well. I will check it out when my parts come home in the container Thanks

 

You are very welcome! Now I understand how my wipers work! I try to keep up with the posts on older vans so I can learn more about how mine works..

I was curious since you mentioned yours is a 1977. We have a 1978 E100 in the family.

Yes the switch I pulled out at the junk yard also has the “a small box attached to it and a heap of the harness “... So you should have all the parts. The small black box is the governor.

Well the wiper switch part number for your van with delay is:
Alternate/OEM Part Number(s): 88923915, D3AZ17A553B, D3AZ17A553D, SW1117

The wiper motor is Alternate/OEM Part Number(s): D9UZ17508A, E3PZ17508A

These numbers are the same for 1977 and 1988.

We know the wiring harnesses are different between the 77 and 88 just because there is more junk added to the 88, ecm, and all that but I would bet the basic wiper circuits are the same. I would imagine the wire colors are different though.. The point being that you could use these two wiring diagrams to change yours to intermittent wipers. The connector coming off the harness that plugs into the wiper switch is different between standard and intermittent switches but you have all that anyway in the salvaged switch...

A NOTE from my manual.... When testing the wiper and controls, DO NOT cross polarity or you will damage the PARK is the motor reverses direction.

A thought... I remember talking with someone a year ago or so about the governor for one of our vans and we could not find on then. Now that I see the wiring diagram, it is line voltage, 12volts.
The newer systems use different relays...
Anyway if by chance we had a problem with the governor, I believe one could probably be used from a F150 with a little bit of wiring... But don’t quote me on this, it’s just a thought..

They look like this and can still be bought.
http://i.ebayimg.com/images/g/EmsAAO...ASA/s-l300.jpg

There is also some information about repairing the governors. seems some of the solder joints go bad now and then..

Also after this research, I think the noise my wipers are making may be the rubber bushings that hold the motor in place.. I had mentioned replacing the wiper linkage bushings but so far everything I have come across, at least on the 1988 says you have to replace the linkage... Mine is making noise on the left side of the dash where the motor would be after they have been on a while...

 

Thanks Annaleigh I will check it out when I get the parts