Testing a wiper motor

-
68383GTS

68383GTS

Well-Known Member
Joined
Nov 15, 2007
Messages
7,506
Reaction score
956
Location
East Peoria,IL
How can I test a 3 speed wiper motor before I go through the trouble of replacing my two speed wiper motor.

Thanks,Jim
 
I may be able to do that if I ground it.I think the two speed switch will make it run just not in all 3 speeds.I do have a 3 speed switch also.
 
68383GTS said:
I may be able to do that if I ground it.I think the two speed switch will make it run just not in all 3 speeds.I do have a 3 speed switch also.
Click to expand...

Are you installing it from the outside of the car? I ask this because I have a 3speed wiper on my dart that I installed the lever on the motor 180 degrees off. Now instead of stopping in the down position they stop in the up. I need to unbolt the arm and turn it 180. Just not sure if it can be done from under the hood.
 
SGBARRACUDA said:
Well if you get it changed from the outside let me know please. Mine has been wrong for like 3 years now.
Click to expand...

I could SWEAR I just got done posting a link to service manuals.

Page 8-80 in the 69 manual
 
SGBARRACUDA said:
Are you installing it from the outside of the car? I ask this because I have a 3speed wiper on my dart that I installed the lever on the motor 180 degrees off. Now instead of stopping in the down position they stop in the up. I need to unbolt the arm and turn it 180. Just not sure if it can be done from under the hood.
Click to expand...
You should be able to do it from under the dash.
 
There was an old Chrysler training video posted not long ago. I can't find it now. Showed testing 2 and 3 Speed. Not sure if it was a you tube link, anybody got it?
 
Bench testing procedure.


Test #1(Hi speed)


Connect jumper wire from motor case to battery ground.
Connect second jumper wire from battery positive to BROWN lead.
Motor should run hi speed continuously.


Test #2 (Lo speed)


Connect jumper wire from motor case to battery ground.
Connect jumper wire from GREEN wire to battery ground.
Join BROWN and RED wires together and connect a jumper wire from battery positive to them.
Motor should run at slower speed.


Test #3 (Park)


Connect jumper wire from motor case to battery ground.
Connect jumper lead from GREEN to BROWN wire.
Connect jumper wire from red wire to ground.
Connect jumper wire from Blue wire to battery positive.
Motor should reverse and park.


(Depending on where the motor had stopped the park feature may have a full rotation or very short rotation
 
and the wiring for the three speed switch

If you look really close at the switch there are identification letters stamped in near each connection. They are sometimes hard to make out
wiper.jpg


B is for Battery - This is the 12volts coming from the ignition to power everything. It is powered with the key in ACC or ON position.

B/U is for BackUp. - 12v comes in through B goes through a circuit breaker inside the switch and goes out B/U to the switch for the back up lights. (No idea why they ran power for those lights through the wiper switch, but there it is! image)

W is for Washer - When you push in the button, 12v from B goes out through W through the bulkhead connector to the washer pump.
--------------------------------

Now the other 4 are a little more complicated. They all go from the switch through a separate plug at the bulkhead to the wiper motor.

A should be a black & white wire. With the switch in the off position, it is connected internally to F2. With the switch in any of the on postions it is connected to B and provides 12v+ to the wiper motor.

P is for Park - this should be a dark blue wire. With the switch in the off position it should be connected to B and provide 12v to the wiper motor (once the wipers reverse their cycle and park, a switch inside the motor itself shuts off the power there) With the switch in any of the on positions P isn't connected to anything.

-----------------------------------------

F1 and F2 provide power to a shunt field in the motor. The amount of power going through this shunt field is what controls the speed the wiper motor spins at.

F2 should be a yellow wire. In the off position F2 is connected internally to A. In any of the on positions F2 is connected to the metal casing of the wiper switch. This provides a ground connection through the dash.

F1 should be a red wire. In the off position F1 is connected to the metal casing of the switch. In the on positions F1 is connected to A & B, but with a variable resistor in the circuit. At the slowest wiper speed there is no resistance, so F1 gets the full 12v and sends it to the shunt field in the wiper motor. At the fastest speed it looks like there is about 25 ohms of resistance between F1 and (A&B) so the voltage going to the field shunt is less than 12v.
 
You must log in or register to reply here.
-

Back
Top