Mathis, Contrary to some opinions, use of a diode in typical Declo 10 SI Alternators IS NOT TO PREVENT BATTERY DISCHARGE its to prevent the tractor from still running even when an ignition switch is turned off (in typical wiring systems) .... Furthermore I prefer use of a 10 ohm current limiting resistor in lieu of a diode amyway, but thats another story.
The gents below have already described and Bob posts a picture as to how to excite the alternator in a way that DOES NOT discharge the battery (regardless if you use a diode or my resistor to prevent running with the switch off) and I think its easier then a toggle switch cuz you dont have to do ANYTHING no switching to be bothered with, although sure a switch (if properly wired) is okay if thats your choice
If you wanted to use an in line diode in the charging system (for some reason) it would have to be like a 50 amp or bigger but if the alternator is correct and wired correct it dont discharge the battery anyway
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