[E-Type] Bench testing wiper motor?

I re-soldered the new wires into the wiper motor (twice! as the first set
proved WAY too large to actually allow the motor to be put back together),
cleaned everything up, oiled and greased, etc, and it looks fine. But before
I get a bunch of stuff into the car which would make taking the motor out a
pain, are there any basic tests I can run? Can I just hook green up to power
to see if it spins? Or green + another lead? Or…? If there’s not, I’ll
take my chances, but it would be nice to test.

Roger Los______________________________________________________
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In reply to a message from Roger Los sent Sat 21 Apr 2012:

The Jaguar shop manual describes how to bench test it
Doug–
Douglass Harroun
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You guys seem to have a better breed of factory manual than I do. Mine
simply provides an unlabeled diagram of the wiper circuit and suggests that
might prove acceptable for troubleshooting. Is my “complete original”
workbook not the choice publication?

Roger Los______________________________________________________
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In reply to a message from Roger Los sent Sat 21 Apr 2012:

The test procedure is quite complicated, and many people quite
unnecessarily conclude their motor is faulty . To test the slow
speed : i.connect green to live of power source ii. join brown and
red together and connect to earth of power source iii.connect blue
and white together

To test fast speed : i.green to live ii.join yellow and red
together and connect to earth iii. join blue and white together

Good luck with it–
christopher storey
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In reply to a message from Roger Los sent Sat 21 Apr 2012:

Roger,

Page P.40 of the Service Manual gives the test procedure for the
DL3 wiper motor.

-David–
The original message included these comments:

You guys seem to have a better breed of factory manual than I do. Mine
simply provides an unlabeled diagram of the wiper circuit and suggests that
might prove acceptable for troubleshooting. Is my ‘‘complete original’’
workbook not the choice publication?
Roger Los


davidxk '56 XK-140 OTS, '69 XKE OTS , '98 XK8
Monterey CA, United States
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Just read your reply to a question about bench testing a wiper motor. I’m not very knowledgeable on electrics. Two questions:

  1. Can I just run wires from a battery for the power source and ground?
  2. Will this work for a 64 etype wiper motor?

Hope this finds you in good healthl
Thanks,
Al

Al

Well it’s a long time since I have done it , and it does rather depend on which of the several wiper motors you have , so I cannot say it will definitely work for your motor, but the answer to your first question is Yes, you can use an ordinary 12v battery ( or indeed an old style battery charger) . If your car is a 3.8 and still positive earth, then connect green to the negative, and brown and red to positive . Vice versa if your car is negative earth

Strangely enough, there is a similar problem going in a thread on E type ( UK ) forum which you may find has something for you

  The link is     http://forum.etypeuk.com/viewtopic.php?f=3&t=16528

Good luck with it

 Christopher Storey

I’m actually in the middle of doing this now with my freshly restored/replaced parts.

The attached document that I lifted from Harvey Ferris’ blog written by Dick Vandermeyden plus page 351 of Bentley together explain it nicely.

As noted it is fairly complicated with good potential to do some low voltage DC welding. I made up a cheater harness with insulated alligator clips on the bullet connectors and spade connectors on the opposite ends to attach directly to the switch and a small house alarm battery. You’ll need to lift the ground at the right moment to simulate the parking operation.

I highly recommend using the real switch. In my case I found the switch to be intermittent. Upon disassembly and cleaning (an adventure in spring loaded small parts) I discovered the brass contacts had worn divots sufficient to make it intermittent. So had to replace the switch. With luck I’ll be re-testing it all again tomorrow.

wiper-articles.pdf (551.8 KB)

Rick OBrien
65 FHC in FL

Here is my bench test hookup. Shown in the Off position. Touching the bare alligator clip to the (-) battery pole will cause the motor to reverse (park). Flipping the switch to the right is Lo and Hi speed (with the alligator removed from (-) as shown).