To check: Disconnect F and A 1 terminals, tape ends to prevent grounding.We had to overhaul the main diesel engine and decided to put an electrical start on the tractor at that time.Everything bolted up fine, we did need to remove the divider in the battery box on the 70, and replace the generator bracket along with make a holder plate for the regulator.The problem came in when we tried to find accurate knowledge on wiring and how the electrical system worked.
We interviewed a number of persons who all claimed they understood the 24 volt system. Every. His name was Clyde Henry who had been a serviceman and salesman for an older John Deere dealer. Sichi Farm Supply in 84 Pa.) Clyde filled in the pieces of the puzzle for us and using the info below we have had almost no problems with the system, other than the normal battery replacement. We later purchased a 720 Diesel that came with electric start. We re-wired the system to our specs and it worked trouble free for years until we sold the tractor. That also doesnt mean we are experts or that ours is the only way, but the info you find here will go a long way in helping explain the ins and outs of the JohnDeere 24 volt electrical system. Basically there are 3 separate electrical systems within the one main. The 24 volt system must, at all times, have each component isolated from. Again: the Entire cranking and charging circuit is carried by wires.No part of it is grounded to the tractor frame. Voltage from Battery A controls left hand or flywheel side of. The 50 ohm resistors are provided on the ignition switch to guard against a sudden surge of voltage or in the event 24 volts should ever arise. John Deere Relay Replacement T158353 Location On Tractor Series Between BatteryAn additional protection that we used is the addition of a master disconnect switch located in series between Battery A negative post and the solenoid BAT post. Hooking the negative post from Battery B and the positive post from Battery A to two separate frame grounds (as was original J.D. As a side note, many owners of these tractors have also found them to have somehow been able to start themselves. In the middle of the 4020 series, Deere returned to hooking the batteries in series with a small ground wire. When the tractor starts and generator begins to produce electricity, current flows from A 1 (white wire) to Indicator Light. The Indicator Light is a reverse flow type of switch which causes the bulb to go out when current flow is reversed. The current then goes from A 1 to the voltage regulator ARM terminal, through the regulator, out the Blue wire to BAT A on Ignition Switch, to load if needed (lights, etc) If no load, then current will flow on Blue wire from BAT on Regulator to solenoid and on to Battery A. John Deere Relay Replacement T158353 Location On Tractor Generator A 2Current also flows from Generator A 2 (brown wire) to Ignition Switch Bat B, then to load and to GND on Regulator, then to solenoid terminal, through shielded ground wire to starting motor post nearest. Generator produces its own current to increase magnetism in field coils, controlled by Black wire from Gen F to Regulator F. Generator output (depending upon state of battery discharge and load) should be 10 amps.
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