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John Deere Tractors Discussion Forum
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Lights won't work

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ashfarm

07-22-2005 12:44:05




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Working on a 50, with negative ground and 12 volts. I have power up to the light socket, but when I install the light bulb it goes dead. Light bulb works with the charger. And have tried 2 other bulbs also. What could be the problem? These are new lights.




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55 50

07-25-2005 20:29:42




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 Re: Lights won't work in reply to ashfarm, 07-22-2005 12:44:05  
A 50 is supposed to have positive ground. Has someone rewired it? Also further down you mentioned it tripped a breaker. There are no breakers on a 50 unless again someone modified it.



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ashfarm

07-27-2005 00:51:31




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 Re: Lights won't work in reply to 55 50, 07-25-2005 20:29:42  
One of the previous owners changed the ground system. I'm not sure if there is a breaker. Test light is on until I put the bulb in, then it goes dead. After I take the bulb out it stays dead until I turn the switch off and wait. That is why I thought there was a breaker or something of that nature.



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420TEE

07-23-2005 11:44:58




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 Re: Lights won't work in reply to ashfarm, 07-22-2005 12:44:05  
I had a similar problem on my 420 when I got it. The previous owner just cut the wire to one headlight and tied it off. I found someone had switched the hot and ground wires on that light so it caused a dead short when the lights were turned on.



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ashfarm

07-23-2005 01:43:58




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 Could it be the switch? in reply to ashfarm, 07-22-2005 12:44:05  
Lights work fine when I ran a hot wire directly from the battery to the light. And also when I touched the light wire directly to the power "in" on the switch. But when wired correctly to the switch it throws the breaker as soon as you turn the switch on.



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Randy in OH

07-23-2005 05:17:54




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 Re: Could it be the switch? in reply to ashfarm, 07-23-2005 01:43:58  
It could be the switch since by your last post it sounds like you overload a breaker by using the light switch properly, but not by bypassing the switch and shorting the light feed wire to the incoming power wire on the switch. Pull all wires off of the switch (after you've labeled them of course) and check continuity with an ohms meter from the terminal that used to be the power feed to the switch to ground. Select all positions of the switch to see if any setting gives you a current path from the power feed terminal to ground. If so, the switch is bad.

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CLW

07-22-2005 14:53:34




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 Re: Lights won't work in reply to ashfarm, 07-22-2005 12:44:05  
I agree with the others, I grounded the seatback frame to the tractor and it fixed everything. Take a peice of wire and touch from the - post of batt. to the frame of the seatback and see if it don't work.
CLW



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old

07-22-2005 12:52:18




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 Re: Lights won't work in reply to ashfarm, 07-22-2005 12:44:05  
Most likely you have a problem with your ground, thats also the most common problem with any light system



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Bobl1958

07-22-2005 14:46:00




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 Re: Lights won't work in reply to old, 07-22-2005 12:52:18  
Old is more than likely right. A lot of the time you can take the nut loose and scratch, or sand paper a little to help get a good ground. A back light on the seat is the same. Especially if you have painted the tractor. You can run a test wire, or test light from a good ground to the light housing, or if you have the lense off to the reflector, and it will probably work, which means bad ground. Good luck-Bob

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Jim Nauert

07-23-2005 17:41:00




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 Re: Lights won't work in reply to Bobl1958, 07-22-2005 14:46:00  
Had the same problem with my lights on the 420. They were new too much paint on the stud. And get the bracket down to bare metal put a touch of deox or greese on the stud and bracket to keep it from rusting.



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