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Discussion Starter · #1 ·
i am looking for the definitive answer
what are the differences in form ,fit ,and function.between 3 and 4 terminal wiper motors on 66 cars.
i have found a source for the parts just want to make sure i get the right one
thanks


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jason pollock
66 el camino
s.c.c.c.c #411
T.C.# 1954
n.e.c.o.a
 

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Discussion Starter · #3 ·
john,
my source believe it or not is autozone.and both the 3 and 4 terminal are 2 speed.so what s the extra terminal for???????
thanks for your time


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jason pollock
66 el camino
s.c.c.c.c #411
T.C.# 1954
n.e.c.o.a
 

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I asked a similar question a few months ago when trying to hook up my 4 terminal wipers (out of the car for 12+ years...)

<BLOCKQUOTE>quote:</font><HR>The wiring for the wiper motor is a little tricky. The following explanation is for a 66-67 wiper motor. Other motors
are similar. The wiper motor always has +12vdc applied to two different circuits internally when the ignition key is
on. One is to make the wiper motor run when you turn the wiper switch on, the other is to keep it running until it
has reached the park position after you have turned the switch off. The wiper switch applies ground to the motor
to make it work. When looking at the wiper motor from the front of the car, there is a vertical set of connections
just to the left of the washer assembly. There will be either 3 or 4 spade type connections. The motors with 3
connections
, are from the top, +12vdc, low speed ground, hi speed ground (might be confused as to which one is
low speed and which one is hi speed). If the motor has 4 connections, the top two are +12vdc, then low speed
ground and hi speed ground. With 12vdc applied to the top connector and ground applied to one of the bottom
two connectors, the motor should run with the speed dependant on which connector is grounded. If you remove
the ground, the motor will stop, probably not in the park position. To park the wiper motor, ground the metal case
of the wiper motor. When installed in the car, this ground is through the brass eyelet around one of the rubber
mounting grommets. When the motor reaches the park position, it internally disconnects the ground and the motor
stops. The 12vdc is also connected to the washer pump, and ground is applied to the solenoid in the pump
assembly when the button is pushed on the wiper switch.<HR></BLOCKQUOTE>

Here's the link: http://www.chevelles.com/forum/Forum22/HTML/000734.html

Another, but similar http://www.chevelles.com/forum/Forum22/HTML/000771.html

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"Once you go RAT, you never go back..."
TC #1366
Tony
The Chevelle
Dual Quad 396
Side View



[This message has been edited by 1966_L78 (edited 01-15-2003).]
 

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Discussion Starter · #5 ·
thank you excellent answer

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jason pollock
66 el camino
s.c.c.c.c #411
T.C.# 1954
n.e.c.o.a

[This message has been edited by 66brit (edited 01-15-2003).]
 

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I hate to say this, but it's not 100% accurate. I believe there is another way these 4 terminal motors are wired up. On my 4 terminal motor, the top two terminals are linked together - they are electrically the same terminal.

I believe you ground the 3rd terminal down for the high speed wipers, and then the 3rd & 4th together for the low speed wipers.

I'm going down to the shop now to verify all of this, and will let you guys know what I find out.
 
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