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Car Forum / Dodge / Dodge Trucks / August 2007160 amp alternator
Would like to know what is the voltage range the PCM sends to this alternator. This is off a 2000 Durango. I have tried a standard electronic voltage regulator but it sends 12 volts to this alternator and was told that they require less voltage to work properly (5v?). Would appreciate any help with this project. Thanks, evlu > Would like to know what is the voltage range the PCM sends to this alternator. > This is off a 2000 Durango. I have tried a standard electronic voltage > regulator but it sends 12 volts to this alternator and was told that they > require less voltage to work properly (5v?). Would appreciate any help with > this project. > Thanks, evlu The way it works is like this. The PCM or regulator sends voltage (actually current) to the field one of two ways, by varying the + voltage to the field, or by always sending battery voltage and varying the ground circuit. Either way, it send more and more current until the battery reaches the desired voltage, then it backs off. There is no set voltage. The required voltage to the field will vary depending on the load, I.E. headlamps off or on. AC off or on. And so on. Al > Would like to know what is the voltage range the PCM sends to this alternator. > This is off a 2000 Durango. I have tried a standard electronic voltage > regulator but it sends 12 volts to this alternator and was told that they > require less voltage to work properly (5v?). Would appreciate any help with > this project. > Thanks, evlu The alternator field winding is driven by a PWM (Pulse Width Modulated) signal that goes from zero to 12V. The more output current needed from the alternator, the longer the ON time and the less OFF time of the PWM signal, affecting the average voltage to (and current in) the field winding. Examples: 12V x 10% ON time = 1.2V 12V x 50% ON time = 6.0V 12V x 90% ON time = 10.8V Thus, the duty-cycle for 5V would be approximately (5 / 12) x 100 = 41.67%. The current in the field winding is directly related to the average voltage to it. However, since Power = Volts x Amperes, the power consumed in the field isn't a straight line. Bryan |
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