2006 5.3L LM7 Alternator wiring
01-17-2009, 08:16 PM
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2006 5.3L LM7 Alternator wiring The engine is a 2006 5.3L LM7 out of a 1/2 ton Silverado. I have the generator battery control module (GBCM), but I do not want to use it because I have already cut and removed the plug (oops). The alternator is a 145 amp model with a two wire plug on it. The wires are brown for "charge indicator control", and gray for "generator field duty cycle signal". The PCM plugs for my model year are not populated in C2-15 or C2-75. How can I eliminate the GBCM? Do the two wires from the alternator get hooked to the PCM? If so, will the PCM already be programmed to control the alternator through those pins?
I've searched, but have not come up with a definitive answer. The only other solution that I have found is to use a resistor or light bulb, but I'm not sure if that is the correct way to eliminate the GBCM.
I've searched, but have not come up with a definitive answer. The only other solution that I have found is to use a resistor or light bulb, but I'm not sure if that is the correct way to eliminate the GBCM.
01-17-2009, 08:37 PM
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So after a little more searching, I finally found what I believe to be the correct answer. The brown wire for charge indicator control will go to an ignition switched 12v source through a 470 ohm, 1/2 watt resistor. The gray wire for generator field duty cycle signal will go directly to an ignition switched 12v source.
The only reason that I would question this setup is because the gray wire is for generator field "DUTY CYCLE SIGNAL", as opposed to just a generator "field". If this is a problem, please let me know.
The only reason that I would question this setup is because the gray wire is for generator field "DUTY CYCLE SIGNAL", as opposed to just a generator "field". If this is a problem, please let me know.
01-18-2009, 06:02 PM
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My understanding is that the resistor has the same function as a light bulb, to cause a slight voltage drop.
01-18-2009, 08:35 PM
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You are correct about that. I have an idiot light running to my 2 wire truck alternator. While my idiot light does not seem to work when the alternator isnt charging, I can tell you that you do not need to connect the field wire. Mine charges with just the brown wire connected, nothing else. I just need to figure out my idiot light problem.
01-21-2009, 11:41 PM
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Load manager
02-20-2009, 07:20 PM
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So after a little more searching, I finally found what I believe to be the correct answer. The brown wire for charge indicator control will go to an ignition switched 12v source through a 470 ohm, 1/2 watt resistor. The gray wire for generator field duty cycle signal will go directly to an ignition switched 12v source.
The only reason that I would question this setup is because the gray wire is for generator field "DUTY CYCLE SIGNAL", as opposed to just a generator "field". If this is a problem, please let me know.
The only reason that I would question this setup is because the gray wire is for generator field "DUTY CYCLE SIGNAL", as opposed to just a generator "field". If this is a problem, please let me know.
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03-20-2009, 11:32 PM
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No, I did not install a charge indicator light. I have a voltage gauge in the stock dash which has always been fairly accurate. The motor is installed in a Jeep TJ, and I recently did some fairly hard winching and the alternator was able to keep up rather well.
