Mombu 2012-01-24 17:45:51
My wipers stopped the other day. I started at the switch and worked my
way up to the motor, I am pretty sure the problem is in the motor
itself, but it might be the intermittent control module. I don’t know
how to test that, though, and hoping one of you might have some
This is why I think the switch is OK:
– The switch still works for the washer pump (press down on this
switch from any position).
– When moving the switch into any of the on positions, I can hear the
intermittent controller click.
I think the control arms and linkages are OK because the arms can’t be
If the intermittent controller can be called good because it clicks
(can it? that’s one question) then the problem is likely at the motor
or between the IC and the motor.
What I could use here are the electrical test procedures for the
intermittent controller and the wiper motor harness.
I’d love to get lucky and find out it’s just brushes 🙂
Curmudgeon 2012-01-24 17:45:54
Might be helpful if you included pertinent details on the truck you’re
Mombu 2012-01-24 17:45:57
Yes, you’re right 😉
86 Dodge Ramcharger SE, 360 4×4.
Dimbo spams 2012-01-24 17:46:00
what part of the header to his post did u miss…………………I cant
believe engine size matters to his question? I would think that his
questions would apply to anyone looking for the same problem, regardless of
engine size etc, cause that’s all the extra info he posted. So does that
make this more relevant and you will now provide an answer to his question?
Somehow I doubt it
Mombu 2012-01-24 17:46:04
Is the power fuse to the wipers still good? Could be control power
is from a different source. wag
Mombu 2012-01-24 17:46:06
Fuse is good. Power is def being sent through the switch to the
intermittent controller, so I think the switch is ok too. The
intermittent is clicking when powered, so it MAY be good but I don’t
have the test procedures to verify.
Roy 2012-01-24 17:46:31
I see you have yet provided the answer yourself.
Mombu 2012-01-24 17:47:01
Flames aside, anyone have ideas?
Roy 2012-01-24 17:47:07
Geta friend and a meter, have the friend hit the switch, see if there is
anything going on between the controler and the motor with the meter.
Christopher d. 2012-01-24 17:47:09
break out your test light and connected it to ground then probe the “hot”
wire going to the motor. unplug it if you need to. with the light
connected between the power and ground when you cycle your wiper switch
you should see your test light “light up” should blink as the
intermittent wiper controller does its thing and should burn steady on
consult your wiring diagram if in doubt what wires are the “hot” and
“ground”….best i can do for you as i dont have a wiring diagram or a 86
ram charger to look at.
Mombu 2012-01-24 17:47:12
I pulled the motor off the truck last night. I test for voltage at the
harness with the switch on, and I got a reading. On this wiper motor
is a little module with 5 spade slots that plug into the motor just
above where the harness connects. I took that off, and plugged the
motor back in and the motor works if I manually ground one of the
On the motor body, there are 4 spades for the harness, lined up like
this: | | | | and checking continuity against a 5th spade the module
plugs into, the outer two have continuity with the 5th one, and the
inner two with each other only. Since the module snaps onto all 5, I
imagine it is acting kind of like a bus and distributing power to the
other connections. Testing continuity on this module fails, none of
the slots have continuity with each other which I would expect if
that’s what it is doing.
I think this may be a noise suppression module, inside are what look
like cylindrical capacitors, the only marking I can make out on one is
250v and MAC.
Anyway, heading to the wrecking yard in a bit as the module is not
available without a new motor. And I’m too cheap for that, especially
since the motor works 😉
Mombu 2012-01-24 17:47:15
Not going to the wrecking yard. After my last post, I thought about
what was actually happening. I went back out and plugged that module
in then ran a jumper from the motor mount plate to ground. The motor
does exactly what it should at all switch positions.
Take the jumper off, the motor stops. Looks like I have a bad ground
Will post back with conclusion.