Posted by Janicholson on April 07, 2017 at 19:42:02 from (63.152.202.29):
In Reply to: Re: Alternator issue posted by David G on April 07, 2017 at 19:23:23:
If the system is working as it should, the regulator in the Hitachi acts as follows: When the key is turned on, the ignition voltage goes to the L terminal through (small light, 10 ohm resistor, or Diode. This voltage is sensed as excite voltage and causes the field to turn on. The voltage going to the regulator is sufficient to light the light bright because the regulator acts as a ground in this condition. As the engine starts, the Hitachi (through the regulator) supplies charging voltage to that terminal. The bulb now has full voltage on both sides of the bulb, and it goes out because there is no ground. If the regulator fails, or the brushes on the rotor fail, or it is wired wrong, the light can be flickering, on steady but dim, or bright. If the source to ignition is on the coil side of the ballast resistor it can stay lit as well. Does this help? Jim
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