Posted by jdemaris on September 25, 2013 at 04:55:20 from (70.215.11.151):
In Reply to: Re: john deere key sw posted by Big P on September 24, 2013 at 17:01:13:
OEM switch has a built in ballast resistor that comes off the I terminal. It is made for a fixed load that the ignition coil provides. When you put the extra load of the alternator field on it - its resistance will increase. It is made with the correct ohms resistance to power the coil only.
If you need to use the original switch - you can either tap into the power before the resistor for the alternator field - or just install a second switch for the alternator field. If you tap into the OEM switch then yes, you need a diode that can handle 5-10 amps. Otherwise once started, the tractor won't shut off.
Using a universal key switch with an ACC position makes it a lot easier. When "off" the "ACC" and "IGN" terminals are isolated from each other. If you use "ACC" for alternator field and "IGN" for ignition - no diode or extra switch is needed.
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