Truck alternator not energizing via ECM
#1
Truck alternator not energizing via ECM
I know, another alternator thread... I did some searching and found enough info to get me where I'm at, but now I'm stumped.
The alternator is hooked up through the factory ECM (Blue/Green 2004 LQ4). The alternator was not working, so I tested the two wires going into the regulator and the green one has 12v, but the brown energizer wire has 0v. I wired the alternator manually using the resistor method and the alternator works fine.
I'd like to have the ECM control things rather than using the work-around method with the resistor. Any ideas why the ECM wouldn't put out a signal through the brown wire? Everything appears connected properly. Is there even an advantage to having the ECM control the alternator?
Thanks.
The alternator is hooked up through the factory ECM (Blue/Green 2004 LQ4). The alternator was not working, so I tested the two wires going into the regulator and the green one has 12v, but the brown energizer wire has 0v. I wired the alternator manually using the resistor method and the alternator works fine.
I'd like to have the ECM control things rather than using the work-around method with the resistor. Any ideas why the ECM wouldn't put out a signal through the brown wire? Everything appears connected properly. Is there even an advantage to having the ECM control the alternator?
Thanks.