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Aircraft Voltage Regulator Frequently Asked Questions 
Try out our charging system software by downloading the demo version. Step-by-step instructions for diagnosing alternator charging system problems. Learn more about this program and other Mechanic's Toolbox programs
What is a TYPE B alternator system The “Type B” system has the VR connected between the alternator’s field and power. The VR regulates the BUS voltage by controlled powering of one side of the field (the other side of the field is grounded). A “Type B” alternator typically has one field terminal, or two terminals with one terminal connected to ground. Ford alternators are typical examples of “Type B” alternators. Even momentary grounding of the field (typically caused by wiring short, or failing alternator) will result in a field over-current condition damaging an unprotected VR. What is a TYPE A alternator system The “Type A” system has the VR connected between the alternator’s field and ground. The VR regulates the BUS voltage by controlled grounding of one side of the field (the other side of the field is powered). A “Type A” alternator typically has two field terminals. Prestolite alternators are typical examples of “Type A” alternators. Uncontrolled grounding of the field (typically caused by wiring short, or failing alternator) will result in an over-voltage condition, possibly damaging the VR and other electrical components. Where can I find more information on troubleshooting charging system problems You can find it at the Sky Ranch web site. From the home page select TROUBLESHOOT then select Alternator or Generator. You can also find a wealth of information at the Zeftronics web site. www.zeftronics.com Why you need a field-to-ground short protected regulator (ACU) ACU == alternator control unit If the alternator's field becomes shorted to ground, it will damage most ACU'S. This is the most common reason voltage regulators fail. Some ACU's such as the R15V0L, R15300, R1530B have built-in field-to-ground short protection that will deactivate the voltage regulator if a ground short is sensed on the field. Other regulators such as the popular R15100 do not have short circuit
protection. Short circuit
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