| Q. | What is a “Type A” alternator system? |
| A. | 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. |
| Q. | What is a “Type B” alternator system? |
| A. | 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. |
| Q. | What does this light on my regulator mean? |
| A. | It is probably a Fault and/or Function Indicator. If it is Zeftronics unit, search for the part number of your regulator to find out what the different indications can tell you about your charging system. If it is any other manufacturers unit, contact us. We can usually tell you what it means. |