Posted by Owen Aaland on August 12, 2015 at 08:30:09 from (216.47.32.139):
Normally when using a series parallel switch the main electrical system will be 12 volts with 12v (or 2 6V paired) batteries connected in parallel through the switch. When the starting system is engaged the switch change the battery wiring from parallel to series for the starter giving 24V to the starter only.
John Deere did not do anything that simple. They have basically three different sections of the electrical systems on the tractor. There is a 12V battery connected with positive ground in relation to the chassis. There is another battery that is connected with negative to the chassis. Each battery has part of the 12V electrical load. Then you have the charging and starting system. The whole system is a 24V system that works independently of the chassis. Both the starter and generator have both positive and negative terminals and no electrical connection to the chassis.
There is no way for a series parallel switch to work with that type of system.
This post was edited by Owen Aaland at 01:07:09 08/13/15 2 times.
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