Alternator excitement issue
03-13-2012, 11:06 PM
#1
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Alternator excitement issue Im having an issue with my alternator always being excited, the alternator is a truck style 4 pin unit. The factory wiring for the alternator has not been changed and the ecu controlls the alternator fine with no check codes.
I did a volt test and am getting 2.75 volts on the brown indicator light wire when the ignition is off, if I disconnect this wire the alternator is no longer excited. There is no voltage on the field duty cycle wire.
Help!
I did a volt test and am getting 2.75 volts on the brown indicator light wire when the ignition is off, if I disconnect this wire the alternator is no longer excited. There is no voltage on the field duty cycle wire.
Help!
03-13-2012, 11:48 PM
#2
First, I have to say that I'm not familiar with the truck style alt.
Does having that 2.5v (exciter) cause a normal charging voltage (say, 13 to 14.5v) at the battery? I was under the impression that the normal exciter voltage range was between 4 to 9 volts, and any level under the 4v was not enough to cause charging voltage.
Does having that 2.5v (exciter) cause a normal charging voltage (say, 13 to 14.5v) at the battery? I was under the impression that the normal exciter voltage range was between 4 to 9 volts, and any level under the 4v was not enough to cause charging voltage.
03-14-2012, 03:03 PM
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First, I have to say that I'm not familiar with the truck style alt.
Does having that 2.5v (exciter) cause a normal charging voltage (say, 13 to 14.5v) at the battery? I was under the impression that the normal exciter voltage range was between 4 to 9 volts, and any level under the 4v was not enough to cause charging voltage.
Does having that 2.5v (exciter) cause a normal charging voltage (say, 13 to 14.5v) at the battery? I was under the impression that the normal exciter voltage range was between 4 to 9 volts, and any level under the 4v was not enough to cause charging voltage.
