E-Unit Wiring for my pre-war Lionel 1688 - HELP!

[Terry in Sooke BC]

Hi folks,

I know from a recent CTT that the motor and e-unit wiring for a pre-war 1688 is a touch different than regular in that the field does not go to ground, and one motor brush does... But a previous owner of my gem tried to re-wire like a usual motor/e-unit matchup.  The problem is he (or she?) used all the same colour wire to add to the confusion, so the original colours are not there as a starting point. 

When taken apart I can make the motor spin and the e-unit work, but have no clue how to wire the loco.  Can someone take picture of the innards of one for me to see, or describe in detail the wiring? I would consider it a kindness.

Thanks so much.  Excellent forum!

Terry Rowsell

[ADCX Rob]

This diagram should be as good a guide as any.  The field winding connections can be switched with the armature connections.  As long as they are wired in series, you just need to change the orientation of one to get the loco to reverse.

[Terry in Sooke BC]

Hi Rob,

Thanks for getting back to me.  I cannot see your diagram.  But I think I know what you mean and will try it.

Cheers,

Terry

 

[ADCX Rob]

Click on image to see it full size in a new window. 

[Terry in Sooke BC]

My system settings may be stripping something.  I don't see anything but your text.  I appreciate your effort.

[ADCX Rob]

If, when you reply, click on "quote", you can see the link to the picture.

[Terry in Sooke BC]

Hi again Rob.  Believe it or not that did not work either.  If you are comfortable doing so, could you email it to me at [e-mail] ??

[ADCX Rob]

The image is at:

https://i.postimg.cc/vGxRCYzW/loc-e-p1.png

 

[Terry in Sooke BC]

Ahah!  The tinypic link did not work.  But the pdf did, so we are on to something. 

So in the image one end of the field goes to ground, while both brushes go to the e-unit.  But I learned through CTT that both of the ends of the field go to the e-unit, while one of the brushes goes to ground.  Is it a simply swap?

[ADCX Rob]

Yes, the field connections are interchangeable 1:1 with the brushes(armature) connections.  They just have to be in series, it doesn't matter in which order.

[Terry in Sooke BC]

Excellent.  Thanks so much.  

:)

[steve1946]

Hi,

Do you know the issue of CTT that the article about the #1688 you referred to in your post of 2011?

Thanks,

Steve