Motor and decoder replacement

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Motor and decoder replacement - Will not run

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Keyser		#1 Posted : 24 February 2025 19:01:56(UTC) Retweet
Joined: 03/01/2021(UTC) Posts: 47 Location: Texas, Washington		I have an early 60’s 3034 electric locomotive that I am changing to a 60987 decoder with a five pole motor. I have done this before and it worked. This time the CS3 recognized and entered the locomotive and the lights come on and change directions. But, that is ALL. Doesn’t run and none of the other functions work even though they have been read and recognized by the CS3. I realize that diagnosing from an e-mail is difficult. I am just wondering if someone else had this issue and how they may have corrected it. The only wires that I have used is: 1)GRAY AND ORANGE TO MOTOR 2) BLACK TO TAB ON MOTOR 3)WHITE TO FRONT LIGHTS 4) YELLOW TO REAR LIGHTS 5) BLUE NOT USED YET UNTIL MOTOR FIGURED OUT 6) TWO BROWN WIRESS TO THE SPEAKER Any and all answers/guesses appreciated


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JohnjeanB		#2 Posted : 24 February 2025 20:13:42(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,550 Location: Paris, France		Hi (Keyser w/o first name) Seems that all your connections are good Apparently you have selected to leave the bulbs as before (no use of the blue wire). This is very fine but the headlamps will flicker. Assuming that you have correctly changed the AC motor for a 5 pole DC one then I would: - verify the motor type in the decoder CV52 = 50 (as factory set) - verify the motor rotates freely when brushes are removed and when rotating gently the wheels - test the motor by applying a DC voltage (8 VDC) after having disconnected the motor from the decoder. - of course the brushes are in place - except for accidental connection of one of the motor wire to digital or frame ground (which is lethal for the decoder) there are little chances for you to have destroyed it. I don't see any other possibiulty. Don't forget, once solved to make the auto-adjust run on a rail loop with digital and CV7=7 and a light rotation of speed knob. Then the decoder takes control (accelerations, stops, brutal direction changes) and blinks the lights until finished. Cheers Jeab
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1 user liked this useful post by JohnjeanB		kimballthurlow
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Keyser		#3 Posted : 24 February 2025 21:32:48(UTC) Retweet
Joined: 03/01/2021(UTC) Posts: 47 Location: Texas, Washington		Jean Thank you for the reply. I will be using the blue wire for the lights. I will not do so until I have the motor running. I will check all of the points you made. The only wire that I did have connected at one time while on the track is the blue with black marking which is the decoder ground for the programmer (what ever that means). Could this have fried the decoder. It is disconnected now and has been since the first track test.


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JohnjeanB		#4 Posted : 24 February 2025 22:17:20(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,550 Location: Paris, France		Hi I have installedc many decoders similar to the 60987 and programmed them directly while on the track from a CS2 and later from a CS3. I never had to connect those blue/orange and blue/yellow wires. Just made them shorter and made sure no accidental contact with anything happens. Those wires you mention are being used with a DecoderProgrammer 60971. Cheers Jean
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bph		#5 Posted : 24 February 2025 22:36:01(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 1,144		what was the blue wire with black marking connected to ? That is decoder ground and should/must not be used unless specifically mentioned. eg one use for that cable is to provide ground(-) for a power pack etc. unfortunately, that might be the cause of the problems. Some other things to check also: (just to eliminate other possibilities) I assume you have connected the red to the pickup shore, even if it's not mentioned? check that none of the aux wires or speaker wires etc does not have an accidental connection to the chassis etc. you might also have "poor" ground, check this topic: https://www.marklin-users.net/forum/posts/t52354-Ground-wire-on-loc-digital-conversion-upgrade if the suggestions from JohnjeanB and this do not check out, it's possible that the accidental use of the blue wire with black marking has damaged the decoder.

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