Agriculture and Farm Equipment
Agriculture and Farm Equipment Repair Questions? Ask a Mechanic.
Need A wiring diagram for John Deere 3020 with a Motorola alternator
JD 3020 Serial number-132375R
Unit may have been poorly converted to alternator type system from a generator before we got it.
This model 3020 has a diesel engine with the 24 volt cranking system, I believe it originally had a generator with two output terminals and has had a later model Motorola 12v alternator installed. It has several wires coming out of the wiring harness near the generator--- two of which are about 8 gauge and were connected to the alternator output. Two in a connector that plugs into a connector on the Motorola alternator's piggy back voltage regulator, two that apparently were either original field or armature connections, and an orange wire that is hanging in the bundle. It seems that the harness was set up from the factory for more than one generator / or alternator application.
I need to know the correct wire to terminal connections because the lights and dash instruments are 12v. I believe the original generator split polarity for the negative ground and positive ground battery (They are wired in series for the 24v starter)
I grew up on the farm and have been a professional automobile technician for 35 years.
I know just enough about this system to be dangerous.....can't just start poking wires to terminals....you're gonna burn up something expensive.
Unfortunately I apparently forgot more about it than the local John Deere dealer knows. They act like they know nothing of this system (all young kids) and they say they would have to order a manual for me...EXPENSIVE...as this is a neighbor's tractor we are resurrecting for them to use after sitting idle a few years.
I'm still waiting on the wiring diagram for a John Deere 3020 diesel with the 24v cranking motor and the 12v charging system....the website keeps wanting $46.00 payment and a rating and I haven't got what I need yet.
John Deere 3020 Serial #123375R - Diesel engine (2 Batteries)
I need a wiring diagram for the charging/starting circuit.
This is my first time using this website and so far it hasn't helped me.
Nothing personal against you...this is an unusual problem I have but I need a diagram otherwise I would be better off buying a manual from John Deere for $90.00
Remember....it's only 24v on the starter/cranking side of the system and 12v on the rest of the charging / lamps /instruments on dash.
I see why they got away from this set-up...pain to work on.