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John Deere Tractors Discussion Forum

Re: John Deere 420 Crawler fuse

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Author  [Modern View]

05-16-2020 05:43:54

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This may have been asked and answered but I don t see it. Are you using the type of light that has a small bulb and reflector or sealed beam bulbs? What are the bulb, or sealed beam, numbers you are using? The small bulb type lights can have issues with intermittent shorting of the pigtails in the bulb sockets. With the seal beams you need to be sure the routing of the wires doesn t cross in a manner that heating melts the insulation and they short together, or that the hot wire doesn t contact the housing.
What size/ part number fuse are you using? You said you ran new wires but you are just now trying to access the switch the wires hook to, so not all the wires are new it would seem. Where exactly did you run new wires? Did you follow the schematic when you did your wiring?

As for using a bulb in place of the fuse as "wore out" first suggested to you. The test bulb, or light in your case, will light anytime there is a path to ground through the light. This can be a short to ground in the wiring or through a functioning bulb at the end of the wire. To eliminate the grounding through the end bulbs, unhook/remove the bulbs at the end of the wires (prevent the disconnected wires from touching anything that could make a ground). Does your test light still light? If it does you have a short to ground in the wiring. If it does not light the wire is not shorted to ground. Now be aware that vibration of operating machines can cause intermittent shorts.

If you remove the bulbs, isolate the wires, and run the machine around with the light switch turned on, does the fuse blow? If it does, I would say it is wiring, if not it would indicate something in the light assemblies to me.
Just my thoughts

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