Parasitic Drain
Senior Member
Joined: Jul 2012
Posts: 8,999
From: C-Town
Not true. 
Out of curiosity, I just checked my voltage, parked at idle:
12.6v resting
11.4v cranking
15.1v startup
13.6v after 4 minutes( jumped to 13.9v when I turned accessories/lights on)
12.8v after 10 minutes (with all accessories off)
My GBCM is working properly.
If you research your dic error, you will see many posts about GBCM bypass, I don't recommend!
High Output: A Look at Today’s Charging Systems
The GM regulated voltage control system can vary from 11.5 –15.5 volts. As with other systems in use today, the GM system has a fuel economy mode, which is designed to lower the charging system voltage by reducing the alternator field strength.Technicians often diagnose this mode as a faulty charging system, only to find out that the vehicle operates the same even with new parts installed. Simply applying maximum load to the vehicle’s electrical system will cause the PCM/ECM to respond, raising charging system voltage.
GM also designed this system to identify battery sulfation. In response, the PCM/ECM will command the charging system’s voltages to increase to as high as 15.5 volts, even when there’s no electrical load. Sulfation mode will typically last less than five minutes at a time, so, as the timer expires, the system will return to normal charging operation.
12.6v resting
11.4v cranking
15.1v startup
13.6v after 4 minutes( jumped to 13.9v when I turned accessories/lights on)
12.8v after 10 minutes (with all accessories off)
My GBCM is working properly.
If you research your dic error, you will see many posts about GBCM bypass, I don't recommend!
High Output: A Look at Today’s Charging Systems
The GM regulated voltage control system can vary from 11.5 –15.5 volts. As with other systems in use today, the GM system has a fuel economy mode, which is designed to lower the charging system voltage by reducing the alternator field strength.Technicians often diagnose this mode as a faulty charging system, only to find out that the vehicle operates the same even with new parts installed. Simply applying maximum load to the vehicle’s electrical system will cause the PCM/ECM to respond, raising charging system voltage.
GM also designed this system to identify battery sulfation. In response, the PCM/ECM will command the charging system’s voltages to increase to as high as 15.5 volts, even when there’s no electrical load. Sulfation mode will typically last less than five minutes at a time, so, as the timer expires, the system will return to normal charging operation.
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Junior Member
Joined: Feb 2023
Posts: 24
Yeah the radio is definitely pulling way too much. It's not stock, I installed an Android 9 inch screen unit. It was all plug and play connections apart from the acc on wire.
Thread Starter
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Junior Member
Joined: Feb 2023
Posts: 24
Possibly green crusties inside fuse box?
Recommendation: deoxit that socket lol. Get some deoxit and spray it in each suspect fuse insert.
check ground splice pack c105 c106 located behind air box and near abs. Remove them. Clean them. Test them. Reattach them. Deoxit them.
Make certain battery and cable ends are clean, tight and have proper values. Aka 12.6v or better with truck off.
Alt should put out 14+V consistently.
Recommendation: deoxit that socket lol. Get some deoxit and spray it in each suspect fuse insert.
check ground splice pack c105 c106 located behind air box and near abs. Remove them. Clean them. Test them. Reattach them. Deoxit them.
Make certain battery and cable ends are clean, tight and have proper values. Aka 12.6v or better with truck off.
Alt should put out 14+V consistently.
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