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John Deere Tractors Discussion Forum

Re: John Deere 420 Crawler fuse

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Author  [Modern View]

05-11-2020 10:41:42

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Just curious but if turning on the lights blows the fuse, why would not the same thing happen with another light bulb? Just asking before I waste a spare bulb. Since it is a six volt system would using a 12 volt bulb or even a 110 bulb work?

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05-13-2020 18:49:35

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 Re: John Deere 420 Crawler fuse in reply to Bookman, 05-11-2020 10:41:42  
I did some tests but I am not sure what they are telling me.
1. Disconnected the front lights, and left rear light connected. Connected a test light to the fuse holder and the other end to the negative side of battery (crawler is six volt positive ground). Turn on switch and test light did not go on. 2. I ran the test light directly from the negative anode of the battery to the rear light with the wire from the light to the dash disconnected and the test light went on. 3. I ran the test light directly from the negative anode to the disconnected wire from the rear light (running back to the dash) and the test light did not go on.
4. I connected the front lights and connected the test light from the fuse holder to the negative anode and when I turned on the switch, the test light went on, even with the rear light connected. Ummm Any thoughts?

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wore out

05-11-2020 11:58:49

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 Re: John Deere 420 Crawler fuse in reply to Bookman, 05-11-2020 10:41:42  
A short will blow the fuse, but simply light a 6 Volt lamp connected in place of the fuse as it would normally light on six Volts.

NOT gonna hurt the "test" lamp.

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