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Lights not working

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  • Member since
    January 2014
  • 2 posts
Lights not working
Posted by GMnO Fan on Thursday, March 19, 2020 7:50 PM

Hi all. I have an older Atlas Master GP38 (GM&O) that I have intsalled a Loksound Direct decoder in. The locomotive runs fine, but I can not get the front or rear lights to work. Any ideas?

 

Pat

  • Member since
    December 2015
  • From: Shenandoah Valley
  • 9,094 posts
Posted by BigDaddy on Friday, March 20, 2020 9:03 AM

Welcome to the forum.  Your posts are delayed by moderation for just a bit.

You picked a good title, the right forum, but we need more information.   

Did you install LED's?  If so, did you install resistors and what size?

LED's have a polarity.  If you got that backwards, they won't light.

I always test my LED's first.  Haven't found a bad one, but that is another reason for no light.

 

Henry

COB Potomac & Northern

Shenandoah Valley

  • Member since
    April 2004
  • From: Ontario Canada
  • 3,571 posts
Posted by Mark R. on Friday, March 20, 2020 9:51 AM

If you just re-installed the factory LEDs as they were wired, you probably have too much resistance on them. The ESU Direct board already has a 2000 ohm resistor on it to control LEDs directly. Atlas usually solders a resistor right directly to the LED itself. The combined resistance is probably too much to allow the LED to light.

Check your LED carefully. The resistor will be in the black heat shrink attached right at the LED.

Mark.

¡ uʍop ǝpısdn sı ǝɹnʇɐuƃıs ʎɯ 'dlǝɥ

  • Member since
    January 2014
  • 2 posts
Posted by GMnO Fan on Friday, March 20, 2020 10:58 AM

Thanks guys for your responses.  The lights are the stock Atlas ones. I honestly think they are bulbs not LEDs but I'm not 100%. They definitely don't have resistors on them just the straight black and red wires coming from them.

 

Pat

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