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Sierrawolf

By Sierrawolf
in Ask A GM Technician

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Sierrawolf Enthusiast

Sierrawolf

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Hello their im haveing problem electrical with my 03 sierra. I just went threw 3 alternators (cause im into audio and have a high power one now ) But i wanted to know why my volts keep droping when im driveing then come to a stop. When my a/c or heater on my voltage will drop from 14v to 12 or 11 volts and sometimes drops my rpm down causeing my truck to kill. Someone told me about an up grade for the CPU from stoping that problem but i would like to know if it something else that can be done to. Already had the alternator checked and it fine working like it suppots to be. Im Close to 50k on the truck. So please does anyone have any imputs ?

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

When idling, the alternator does not achieve it's full output capability. It is not abnormal for the voltage to drop to 12 volts at idle when you have a load on the electrical system (headlights, heater blower, etc.). I've even seen near 11 volts with high loads when there is absolutely nothing wrong with the charging system.

 

As for the idle stalling problem... clean the throttle body.

Sierrawolf Enthusiast

Sierrawolf

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I'll try that but also it does that even when their is not a load on it. When im driveing down and just have the windows down and no radio or lights on it just puzzeling. I will try clean that to see whats happens.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Perhaps I wasn't clear. I don't believe the throttle body cleaning has any relation to your voltage question. I took the low voltage and stalling as two separate issues.

 

Hopefully, cleaning the throttle body will fix the stalling condition. Voltage is not causing it, nor will cleaning the throttle body raise the voltage readings significantly, if at all.

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