I recently acquired a PS 2.0 equipped SD70ACe. Everything appears to be operable except the front headlight. I have reset the engine several times. Still no working headlight. Does anyone have any other tideas to help troubleshoot? Is there an easy way to determine if the bulb or LED is burned out?
Brian Huang
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several engines have spring loaded contacts to carry power to the headlights. Usually the springs aren't touching fully. Sometimes even, the screws just need tightening. I would check for pinched wires first before tightening though.
I am sure you tried the HDLT button on your remote?
I have also seen that the springs he is talking about sometimes get bent and then don't touch the pc board that is screwed to the inside bottom of the train metal .I ran in to this on one of my Big boys.MTH as well and just ad little adjustment with the spring using my hands and maybe needle nose pliers , only need to be straight up or down not sideways as that will slip off the pc board pads and then the light won't work at all. you can also check the voltage with a DVM digital volt meter and verify the voltage is at the pc boards, also you can unplug or unscrew the bulb whichever applies and check the continuity with the OHM meter for close to ZERO ohms and prove if the bulb is good or bad , if the light is a led it might read .6 or .7 ten's of a ohm the led is ok . you can also unplug the harness from the lights in question and apply voltage with a battery like a 9 volt to check the lamps if they are light bulbs.
Good luck and let us know how you make out!
Alan
you might also try the engine on conventional as that will prove it is not dcs problem.On conventional the lights should all work unless there is a problem with the bulbs or electronics , this way you can determine if it is a DCS or actual problem with circuit , bulb or wiring!
Good luck Alan
Plug in the rear light to see if it works in the front light plug.
Dave
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