# 160 amp alternator

• posted on August 26, 2007, 5:24 am
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
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• posted on August 27, 2007, 1:03 am
evlu wrote:

alternator.
with
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