Posted by john in la on December 04, 2021 at 18:19:29 from (97.80.68.11):
In Reply to: Alternator on a cub posted by grandpa Love on December 04, 2021 at 17:04:07:
One of those small wires is the sensing wire. It measures the voltage deep in the wire system to tell the alternator when to cut off and on. By being buried deep in the system it accounts for voltage drop over the system. Since a old tractor has a very small wiring system hooked to the charge lug like it is works fine.
The other small wire is the excite wire. Power is supplied to this terminal at start up to excite the alternator and start it to charging. Once charging the alternator sends power back out this wire. It is what makes the dash light go out. Equal power on both sides of the light so no current flow. Problem is feedback of power into the system on this wire will supply power to the ignition coil when the key is turned off. Hence the reason you need a dash light or diode in this wire. Exception would be a motor that does not require battery power to run such as a diesel motor. This wire is usually hooked to the key switch also to disconnect power preventing it from draining the battery over time.
So if the motor is such as you can turn it off such as a diesel and you disconnect the battery after each use that system will work just fine.
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