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John Deere Tractors Discussion Forum

1967 John Deere 4020 light switch wiring.

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Author  [Modern View]

05-25-2015 01:14:47

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Hi, I have a 1967 John Deere 4020 diesel that's been converted to a 12 volt negative ground system in the past. I just got the tractor about a month ago. I've noticed some lights not working and I went to replace the light switch ( p/n ar28401 ). I was in a hurry and I didn't ID each wire before I took them off of the old switch. The old switch had 7 spades on it and the new one has only 6 spades on it. Every picture I've found on the internet has a different marking ID on the back of the switch. Mine does not have a BAT A or BAT B. My switch has these markings on it: R2,HD2,TL,HD1,FL, and another that may be B or not marked at all. I have seven wires from the tractor harness to connect to a 6 spaded switch. I've ordered a JD shop manual for this tractor, but I have a feeling it'll be very bland and not answer my question. I thought about asking Agri services who make harnesses for tractors, but I thought Id give this website a try first. The colors of the wires from the harness are: green, yellow, white, blue, black, brown, and red. the tractor has 4 lights for the fenders. I think that the green goes on the HD2 spade and it has a jumper wire from that connector to I think the spade below the resistor looking thing on the switch. I am very surprised that such a popular tractor doesn't have more info available on the internet. Does anyone know how to connect the harness to this switch?

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Tx Jim

05-25-2015 04:10:32

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 Re: 1967 John Deere 4020 light switch wiring. in reply to Tony730, 05-25-2015 01:14:47  
AR28401 will only have one battery terminal as it was used on 4020 gasoline & LPG fueled tractors with 12 volt systems

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Aaron S.

05-26-2015 15:14:36

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 Re: 1967 John Deere 4020 light switch wiring. in reply to Tx Jim, 05-25-2015 04:10:32  
Tx Jim. I just put a light switch in a 66 4020 Diesel. Mine has been converted to 12volt too. I have a brown wire that I am unsure of where it goes. It comes out of the same harness an appears like it would go to the light switch. Do you know which terminal that goes on? Parts book doesn't list it for lighting?? Thanks

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Tx Jim

05-27-2015 04:14:10

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 Re: 1967 John Deere 4020 light switch wiring. in reply to Aaron S., 05-26-2015 15:14:36  
This is wiring diagram for AR28402 switch used for 24 volt system. If converted to 12 volts switch should still be wired the same just attach both brown & blue wires at starter to top post on starter solenoid. If you installed a AR28401 or a 12 volt switch other than AR28402 or AR41288 you'll have to attach brown wire to blue wire.

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SN>91,000 switch AR41288

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This post was edited by Tx Jim at 04:26:05 05/27/15 3 times.

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Aaron S.

05-27-2015 11:36:14

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 Re: 1967 John Deere 4020 light switch wiring. in reply to Tx Jim, 05-27-2015 04:14:10  
Perfect Jim. I had the wiring diagram from the parts book but the diagram is very unclear. Thanks again. Aaron

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05-25-2015 09:17:56

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 Re: 1967 John Deere 4020 light switch wiring. in reply to Tx Jim, 05-25-2015 04:10:32  
Thankyou for your help. Ive figured out the parts people set me up with the wrong light switch. I think I am supposed to have p/n AR28402 light switch which is for a diesel. Do you have a diagram thatll show that switch and its wire connections?

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