DR2 wiper motor

[Whitephrog]

Can a DR2 non self parking wiper motor be converted to self parking?

 

[dklawson]

I was wondering about that after the last wiper motor thread.

I don't think you can convert a non-park to a park-type. The park switch components/cover can be moved from the park motor to the non-park one, but there's still a wire that has to get pulled into the windings isn't there? That's the part that I suspect will be the problem.

I suspect that cleaning and repainting your old motor will be quicker and easier than trying to convert that nice looking NOS motor.

 

[Bayless]

I don't really know about the DR2 but on the DR1 and 14W there is no extra wire into the motor windings. The extra wires are between the park switch on the motor and the wiper switch on the dash. I suspect the DR2 would be the same.

 

[Whitephrog]

My NOS DR2 non self parking has a small hole in the side at the same location the wire passes through on the self parking version. I haven't opened the body of the non self parking version to see if there is a place to connect the wire. I have the internal copper part for the switch but would need a better self parking cap than the one I have assuming all this is feasible.

 

[dklawson]

From your photos of the BE it sure looks like the car is going to be immaculate and very original when you're done. Therefore, if you can re-use your original motor cover plate (either sandblasted and re-plated or painted) I would do so to keep the correct "dates" on the car. The wiper motor cover should have a month and date stamped on it that correspond within a few months (generally earlier) to the date the car was officially built.

I do remember (as Bayless said) that on the square motors the speed was controlled by ground connections made at the dash switch (at least on DR3 motors). I'll look at some wiring information tonight to see how the park switch was handled. Maybe you can make this swap.

 

[Whitephrog]

Thanks for the input. The original DR2 is dated 12 58. (Car was produced 4 January 1959). The NOS DR2 is dated 6 60.

 

[dklawson]

The only schematic I could find was for the DR3 with self parking. Your DR2 may be similar. If you have a schematic showing the function of the switch and its connection to the motor... I'll scan what I have and send it to you for comparison.

On the DR3 one wire provides power into the motor. There are two sets of windings and the dash switch provides a ground path for one or both of these windings. On the DR3 the park switch is built into the cover. It provides a ground connection (like the dash switch) until the motor reaches the "park" position. In the case of the DR3 schematic I have, it shows the park switch connects to the high-speed terminal on the wiper motor.

Again, if you've got a schematic for your DR2 I'll scan what I have for the DR3 and send you a copy for comparison.

 

[dklawson]

Not one to leave well enough alone I did some additional digging on the DR2 and found the following very helpful image:
https://www.tr-register.co.uk/forums/index.php?act=attach&type=post&id=110
(Hopefully the image will load... it's a very strange looking link string).
Full supporting text here:
https://www.tr-register.co.uk/forums/index.php?showtopic=6391&mode=linear

Regardless, what the picture shows is that (like the DR3 I'm more familiar with) the DR2 is supplied 12V on terminal "2". A ground path through the dash switch is established by the wire connected to terminal "1". The self-park switch is ALSO connected to terminal "1".

So, it looks like you could transplant the cover from your old motor to the NOS one if you pull the park switch wire through the motor housing and connect it to terminal "1".

 

[Whitephrog]

Perfect. Thanks Doug. I tore the original down yesterday. There is an outside chance that I can restore it to an acceptable level.