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John Deere Tractors Discussion Forum

Re: John Deere 420 Crawler fuse

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05-16-2020 12:53:45

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See my response to Jim today further down.

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05-16-2020 18:44:14

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 Re: John Deere 420 Crawler fuse in reply to Bookman, 05-16-2020 12:53:45  
This evening I took the wire from the combination switch to the front lights and disconnected it at both end. I put a small 9 volt battery at one end and a ground and then tested the other end with my meter. I am getting electricty through the wire. And I did not see any bare spots on the wire where it might be grounding. Tomorrow I will check and see if there is electricity coming into the switch, although there had to be since the tractor would start. Maybe the switch is wired wrong or there is an internal short in the switch. I do not want to throw money at parts until I figure out what is wrong. Thanks folks.

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05-17-2020 10:10:12

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 Re: John Deere 420 Crawler fuse in reply to Bookman, 05-16-2020 18:44:14  
Okay, This morning I worked so I could get to the back of the combination switch. I ran a direct wire from the negative post of the battery to the battery terminal of the switch. Turned on the lights, and I have lights. So, it must be something between the battery and the switch. Someone mentioned that I might have had too light of fuse in the holder, but it is twenty amphs. Now the base of the fuse holder is wired to the voltage regulator and the side to the switch, but I would not think that would matter, as to which end of the fuse the electricity goes out of....but let me know if it does. I am going to replace the fuse holder anyway since I bent it up getting it out of the holder and broke the plastic piece holding it on. Next step is to trace the wiring from the switch back to the battery. Not sure why if something is bad there, the crawler would run on ignition but blow a fuse when the lights turn on. Ummm

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