Posted by Bob on July 02, 2013 at 23:27:04 from (64.255.159.192):
In Reply to: 4020 jd posted by tbish on July 02, 2013 at 17:44:35:
These two 4010 schematic diagrams posted on the DEERE board by long-time poster "qwece" are REAL close to how the 4020 is wired and MAY give you a little more insight into how the batteries are connected and how 24 Volts gets to the starter solenoid.
ONE difference MAY be that you have a pushbutton for "start", and the diagrams show a key switch with a "start" position.
The little terminal on the solenoid nearest the engine block is @ (+)12 Volts with respect to the chassis, as it connects to the lead at the side of the starter from the (+) post of the RH battery.
The other little solenoid terminal gets connected to the (-)12 Volts with respect to the chassis in a round about way... (-)12 Volts leaves the large upper stud on the solenoid though the blue wire, flows through the large circuit breaker at the starter (if so equipped), though a circuit breaker on the panel, then to "BATT A" on the key switch.
Then out of the key switch as a black wire to starter pushbutton, then out of starter pushbutton as a yellow wire to the neutral safety switch(es) and on to the previously-mentioned other little terminal on the starter solenoid, still as a yellow wire.
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