Posted by Owen Aaland on November 09, 2013 at 04:32:08 from (216.47.33.229):
In Reply to: Delco-Remy Gen 1101355 posted by Stevie J. Mote on November 06, 2013 at 19:03:27:
A cutout does not control the voltage. Like you posted, it only serves a switch to connect the generator to the battery. It needs to close when voltage gets over battery voltage and open again in the charging voltage drops below that level. The battery, by absorbing the amperage coming from the generator, serves to limit the maximum voltage on the output side. The position of the third brush determines the current available to the field coils. The external resistors at either the cut out or the light switch controls how much of this available current flows through the field coils.
If you take a 6 volt generator with cut out and install a 12 volt battery the cut out relay will close when the voltage output from the generator reaches the cut in level. Until the voltage level reaches the voltage of the battery there is no effective resistance from the battery and the voltage will continue to rise until above battery voltage. Once the voltage goes above battery voltage the voltage will stabilize when the total amperage out put is absorbed by the battery.
At that point the 6 volt generator can actually be charging the 12 volt battery. The problems comes when the generator output drops off. Since the cut out is adjusted for a 6 volt battery it does not open when the output drops below battery voltage. Instead current will flow back into the generator. Since the voltage drop back through the armature is usually not enough the drop the voltage at the cut out below the level where the switch will open the contacts will remain closed and drain the battery.
A 6 volt regulator system will not charge a 12 volt battery because once the upper voltage limit is reached the field control contacts will open. Depending on how the cut out contacts are wired in the regulator the may or may not open when the engine is shut off.
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