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2005 Silverado battery light on

minerwelder

By minerwelder
in Ask A GM Technician

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minerwelder Enthusiast

minerwelder

Posted
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I have a 2005 Silverado 1500 5.3L HO, Battery light stays on, I've replaced the alternator, and charge module, and left battery disconnected for a day. Is there anything else?

 

Chris Senior Enthusiast

Chris

Posted
Posted

have the battery and charging system tested. Most parts houses can dp this for you. Also take a multimetet and draw test the battery. If you see a draw, start checking the draw at individual fuses to find the drain, but if the light is always on, my bet is the battery or charging system

 

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Chris Senior Enthusiast

Chris

Posted
Posted

Also check grounding points, battery terminals, cables, and the alternator wiring harness

 

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minerwelder Enthusiast

minerwelder

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Tested battery and alternator,also couldn't find any drawing on system was wondering if ecm might need reset at dealer,but they want $75.00 just to look.

Chris Senior Enthusiast

Chris

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Pcm shouldn't need a reset. Check all the wires abd cables. Last time mine came on, it was because I pit a 2 pin alternator from 05+ on my 2004 truck that takes a 3 pin harness

 

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minerwelder Enthusiast

minerwelder

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I'll check out the harness, I'm sure it was correct but i'll check it and all the grounds, be a week or so my multimeter went in for warranty .

Doug_Scott Senior Enthusiast

Doug_Scott

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Before you replaced the parts, what was the voltage at idle? And at 2500rpm? After changing the parts, what is the voltage at idle and at 2500 rpm?

What is this "charge module" you changed?

minerwelder Enthusiast

minerwelder

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On an 2005 and other years it has a module that the ground lead goes through from the battery its just below the - battery terminal it regulates the charge. been a couple of months since I changed alternator and module so I don't remember voltages but it is arround 12 Volts at idle now and goes up to 14+ at 2500, just barely happened upon this site so I'm asking here since I've already asked other people!

Mckenzie Senior Enthusiast

Mckenzie

Posted
Posted

Replace the alternator with another one. My alternator went out and i replaced it with a new one from NAPA and the battery light would stay on so i exchanged it for another new one and it solved my problem

  • 2 weeks later...
minerwelder Enthusiast

minerwelder

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  • Author
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Don't have a load tester, Used volt meter after charging it has 12.84 volts disconnected ground and left over night had 12.68 volts.

txab Senior Enthusiast

txab

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I'll have the alternator check when I go into town where I bought it.

Have them load test the battery as well

Doug_Scott Senior Enthusiast

Doug_Scott

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You can perform a half-assed load test by using the starter motor. The results you see will be along the lines of a dna test. it will not tell you what is wrong, but it can tell you what is not wrong. Connect a volt meter across the battery. Take the fuse out or unplug the fuel pump, and crank the engine over for 15 seconds. Battery voltage should not drop to below 10 volts. If it does not drop below 10 volts, it is pretty safe to think the battery is ok. If it does not stay above 10 volts, then either starter or battery is likely bad. Take it someone that can test it with an AVR tester.

minerwelder Enthusiast

minerwelder

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Replaced alternator, parts place could not test this alternator, load tested battery good, Light still on anyone know where to get good schematic on 2005 silverado charging wiring with charge module?

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