wiring harness on 4020

Richard G.

Well-known Member
Son is rewiring his 1972? 4020. He bought a wiring harness. Needs a little help. Anyone have a manual for the wiring or can I find it online? Having problems with the wires going to the solenoid relay and what ever these things are under the dash in second pic. One of them is broken.
Thanks, Richard in NW SC
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Things in second pic are fuses/circuit breakers. Can"t be reset. Looks like wiring has overheating issues. Should be able to access service manual with diagrams, on line. There are multiple wiring harnesses on a 4020, some specific to serial numbers.
 
I have tried to find diagrams online, but am having no luck. Can someone send me a link?
Thanks, Richard
 
I am not aware of the service manual being on line like the parts lists are. I bought a service manual on a CD from the dealer. Wire changes with cab/no cab, serial numbers etc. Suggest you get the CD. Paul
 

I have used wiring harness's from this company. The quality is premium, the details correct , the directions exact and the price modest.

http://www.wiringharnesses.com
 
Those are circuit breakers. They might all be broken
by the time you get them disconnected.
The amperage should be stamped on them but parts book
will have them listed.
As far as wiring... just replace them one at a time.
 
I hope he's figuring on replacing the solenoid and the circuit breakers.
My service manual covers the early 4020. I assume they are still available for later 4020.
 
Just make a visit to your local dealer. That's what I did and they made me a copy of the diagram pages with no charge. I no longer have the copy though.
 

I can send you a copy of the wiring Dia if you will give me your e-mail address. My e-mail is open.

Jack
 

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