2008 Trailblazer Charging Problems
Hello everyone,
I have a 2008 Trailblazer, during winter I had 3 times where i need to get a jump, it would not start. I took it to Autozone Then said Alternator was bad.... 2nd opinion was O'Reillys Then said Alternator was fine Its the battery !! Well now, I wanted a 3rd opinion .... Advance Auto Parts, They could not give me an answer , After testing they we lost... I mean Lost.. So I bought a new battery...seems to be ok..When I looked at the battery gauge it said 15 volts.. While running So though problem was fixed. But last week I noticed the gauge went from 15 volts to 12 volts while running. So I bought a new, not re manufactured Alternator and starting the truck is at 15.5volts . Sometime I drive for 30 minutes other times 10 No consistency.. But the Battery indicator goes from 15 volts to to 12.5 V Any Ideas. When the gauge showed 13 volts, I verified it with my Volt Meter It was correct. So I am ruling out the Gauge as the problem. Thank you |
Check your cables to and from the battery and alternator. Check them at both ends for looseness and corrosion.
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Ok did that found nothing wrong.
Its wierd I can make a 30 min trip with no stops and the gauge stays on 15-14 volts. ON the way home I get 15 minutes in to the trip and I see the voltage going down, to 12 volts.. Could a work Serpentine belt cause this? Can the computer be causing this? Here what I fine that may be the problem Regulated Voltage Control Module, any thoughts. |
You are chasing a non existent problem unless you are ending up with dead batteries. The computer adjusts the charging voltage according to load , battery temp and some other parmameters and it will range anywhere from around 15 volts to down around 12 when there is low load on the battery and charging system . This is normal behavior and even says so in the owners manual .
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