Where to find wiring schematic for 4020?

Scott 730

Well-known Member
Location
EC MN
Parts catalog does not contain the wiring diagram like the books for my 2 cylinders. Where can I get a wiring diagram for a 1971 4020 Diesel, serial # 251648R? Thank you.
 
In the proper service book for that tractor. I don't know if it's still the case, but JD used to be very good about making service books available for each model. My 4020 service manual has several wiring diagrams. Other companies might make you buy hundreds of dollars worth of a service "catalog", which covers many models.
 
(quoted from post at 19:25:58 09/07/17) your local john deere store

Tried that. Told them I need a wiring schematic. They emailed me the parts book page with the wiring harnesses. :roll:
 
The john-deere tech manual TM1006 has wiring diagrams for all electrical parts on your 4020.What diagram would you want. Give call 9524665722.
 
(quoted from post at 21:30:42 09/07/17) The john-deere tech manual TM1006 has wiring diagrams for all electrical parts on your 4020.What diagram would you want. Give call 9524665722.

Thank you for the offer. I ordered a TM online.
 
My dealer prints it out- no charge. Got one for the 4450 a few years ago, trying to chase down a ground issue.
 
(quoted from post at 07:50:41 09/08/17)
(quoted from post at 06:23:05 09/08/17) Service Manual SM2039 has them also. E-mail open.

IIRC SM2039 doesn't cover diesels engine with 12 volt electrical system that OP's tractor has.

[color=red:5b8254677c]Fig. 190-40-7 --Engine and Instrument Harness Wiring for 4020 Tractors 91000 and after with Diesel Engine.[/color:5b8254677c]

Just using what John Deere put in the Index in my SM2039 had no way of knowing how many batteries the OP had. Guess I should have noticed that the SM2039 is dated (01APR67) and OP was a 1971 tractor.
 

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