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John Deere Tractors Discussion Forum
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Re: John Deere 420 Crawler fuse

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Author  [Modern View]
Jim.ME

05-16-2020 10:30:42




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The test light lit with the bulbs connected and not lit when the bulbs are unhooked should indicate there is no ground in the harness wiring; the bulbs are creating the ground path. The exception to that would be if there was a minor path to ground that gets worse when operating, but I wouldn't go down that road yet.

JD calls for that to be a 20 amp fuse. I would put a known 20 amp fuse in it, to be sure it is not just to small of a fuse you are using. Carefully inspect all the bulb sockets, pigtails and springs in the sockets. I have seen the springs break or get deformed then contact a pigtail and cause shorts, the insulating washer that holds the pigtail centered under the bulb break allowing things to get out of place and short, and missing insulation from pigtail wires cause shorts. Carefully check the terminal blocks where the power goes into the light housings and connects to the pigtail. Be sure the reflector or its grounding spring are not touching the power connection.
Since the fuse also provides power for the ignition through the combination switch a short in, or heavy draw on, the ignition wire could blow the fuse. If you have anything else hooked to that switch it could be contributing to your problem.

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