Lionel 1688 wiring

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Lionel 1688 wiring
Posted by trains2353 on Sunday, October 29, 2017 2:39 PM

Acquired a very nice Lionel 1688(not an E). Headlight lites up, but no movement or e-unit noise. Removed the body; found 2 wire not connected. How can I find out were they need to go? I put some pics in if that helps. I understand there are 3 different motors in the 1688. I believe I have the 3 type. It connects to the body with 2 long screws.

Any help greatly appreciated.

http://pic80.picturetrail.com/VOL1001/4368153/24788991/413621749.jpg

http://pic80.picturetrail.com/VOL1001/4368153/24788991/413621750.jpg

http://pic80.picturetrail.com/VOL1001/4368153/24788991/413621751.jpg

http://pic80.picturetrail.com/VOL1001/4368153/24788991/413621752.jpg

 

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Posted by TrainLarry on Sunday, October 29, 2017 3:42 PM

Here is the wiring diagram for the 'E'-unit. It is the same for most engines.

Larry

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  • From: Henrico, VA
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Posted by Firelock76 on Sunday, October 29, 2017 4:44 PM

You may want to consider replacing those wires, they look nasty!

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Posted by rrswede on Sunday, October 29, 2017 5:27 PM

Although Larry's statement is true, that being his schematic is the same for most engines, I am not sure it is true for this locomotive. Please look at the Olsen's Toy Train link.

http://pictures.olsenstoy.com//cd/b123/000546.pdf

swede

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Posted by TrainLarry on Sunday, October 29, 2017 6:07 PM

The different schematics have either the field or brush windings reversed by the E-unit. It does not matter what set of connections is reversed, as the results are the same.

Any motor can be wired either way with the same results.

 

Larry

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Posted by trains2353 on Monday, October 30, 2017 7:38 AM

Thanks guys! I'll be looking at the diagrams today. Wiring is nasty, but going to try and use it. Some wiring color is left, but not much.

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Posted by trains2353 on Monday, October 30, 2017 11:52 AM

After all morning, I have the e-unit working. I got the motor to hummm, but not move. Saw a little smoke from it, so stopped what I was doing. Tried to find a pic online of the motor; none clear enough to see where the wiring went. Perhaps look online for a good running chassis as the body for this one is very nice. Or send it out for repairs.

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Posted by TrainLarry on Monday, October 30, 2017 12:20 PM

Do not concern yourself with the wire coloring, as it will not match the schematic.

Identify the 2 Field winding connections and the 1 (left) Brush connection. The right Brush connection is grounded.

Follow the wiring on this schematic provided by Swede above and you should get the motor to run.

Larry

 

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Posted by trains2353 on Tuesday, October 31, 2017 9:29 AM

Thanks Larry; will try that.

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Posted by Postwar Paul on Sunday, November 05, 2017 11:40 AM

That diagram is correct. I repaired my 1688. One brush goes to frame ground, instead of the field coil going to frame ground, as in most engines.

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Posted by trains2353 on Sunday, November 12, 2017 9:27 AM

Still working on it. The wire from the pickups fell off. Will do more when I solder a new wire back on. The wire that go to the e-unit are going to be a problem to get back on. Looks like they are soldered into a small hole. Guess I need a pencil type soldering gun.

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Posted by trains2353 on Tuesday, December 05, 2017 8:57 AM

Progress; somewhat. Got the wiring corrected, thanks to another 1688. Found the part in the pic with the wire connected to it broken. I am guessing I need a new e-unit?

I know I'm spending alot of time on the 1688(2 of them now), but the bodies both are very nice(one black, the other gray) and I'd like to get them running again.

http://pic80.picturetrail.com/VOL1001/4368153/24793234/413684578.jpg

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Posted by cwburfle on Tuesday, December 05, 2017 11:51 AM

I suggest you learn how to renew e-units rather than replace them. There are some decent videos on YouTube on how it is done.

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Posted by rrswede on Tuesday, December 05, 2017 1:32 PM

I whole heartedly agree with cwburfle. I guarantee you will get a great deal of personal satisfaction out of successfully rebuilding your E unit.

Although many people replace E unit as opposed to rebuilding them, it is not necessary if you have patience, some mechanical skill and can do a bit of soldering.

Attached are two very good videos to assist you in rebuilding or repairing your E unit.

https://www.youtube.com/watch?v=C3cHF_a6CNM

https://www.youtube.com/watch?v=mA6AdfzXo3g

swede

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Posted by teledoc on Wednesday, December 06, 2017 6:56 PM

Trains2353, Just be aware that there is a progression of 1688/1688E locos, that actually use three separate motors.  Your initial 1688 is the last version, circa 1939 & later issue.  That motor is identical to a Postwar 1654 “single reduction” motor, with a Bakelite (plastic) pickup assembly.  The diagram that rrswede provided is correct.  I seriously suggest you try to learn how to rebuild the E units, and look at the provided ‘YouTube‘ videos.  If you have a question about the other versions of 1688’s, just post it.

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