ok guys I got a sd70 ace where the right ditch does not work i han the led checked abd it is fine should i look wor a loose wire or???
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As seen in this topic, there likely is a lighting distribution board. I have seen a few of these with this exact failure of the ditch light due to a cracked or ripped trace for the ditch light socket.
Links to parts or DIY repair in this topic below.
https://ogrforum.com/...4#183311597567931554
@Vernon Barry posted:I would say, no, we are not directly saying it's miswired- but another known possible failure mode is that lighting distribution PCB is single sided copper traces and given stress on plugging and unplugging the jacks- either when removing the shell or during assembly- it's entirely possible to rip a trace or cracked solder joint and not even have a light connected electrically.
The below board may look normal at a head on view of the bottom (ignore where I was trying to scrape the green solder mask off to make the repair to one already identified cracked joint.
It's when you look from the edge or side view- pushing down the on socket cracked and ripped the copper trace !!!!
Again, look closely, the red socket, the entire solder pad and solder joint, there is a physical gap now between it and the PCB!!!
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I have had success with shimming the spring assembly to put more pressure on the pads. It has worked on two different engines.
You need to check the polarity of the ditch light. The SD70 use the spring pad on frame, and the spring holder on shell. If you look at the orientation of the plugs as they contact that pad, the same polarity LED won't work since DC ground would be correctly on black wire on one LED, but incorrectly on RED on the other, because the molex plugs in opposit on the shell contact holder.
The one I just worked on the factory left the wiring in the plug the same, but flipped it at the LED so negative needed to go to red wire.
Then I did need to place either nylon washer under the pad, or electrical tape to raise it. And or stretch springs to ensure good contact.
Bottom line is if the Ditch LED get swapped in that holder or some one swaps one out it can be a combination of wrong polarity or bad contact.
If none of the above the board is suspect. G
