Question about 2005 GMC Yukon

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Battery voltage 2005 yukon

2005 YUKON,I NOTICED A VOLTAGE DROP,THE DEALER PUT IN A NEW BATTERY,AND SAID ALT,WAS FINE,IVE WORKED ON MUSCLE CARS,AND STREET RODS FOR 36 YEARS,DEALER SAID THE BATTERY WILL ONLY ACCEPT THE VOLTAGE REQUIRED,TO HANDLE THE LOAD,VOLTAGE GAGE DROPS TOO 12-13.1 WHILE DRIVEING IT,,,MY ANSWER IS A BAD DIODE,IN THE ALTNATOR,I THINK THE DEALER,IS A ****,HAS ANY SEEN THIS BEFORE,,

www.parmck.com

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  • jimparham7 Jan 27, 2009

    THATS A GREAT,IDEA,I THINK YOU MIGHT BE RIGHT,YOU SOUND LIKE A OLD TIME,MUSCLECAR DUDE,NEVER THOUGHT OF THAT,I WILL CHECK THAT,TOMORROW,WELL DONE MY FRIEND,THANKS MR SCARY66613



    RESPECTFULLY JIM PARHAM

    www.parmck.com

  • Anonymous Mar 20, 2014

    What kind of battery is required for Corolla SE saloon 2005

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Hey Jim, I Too have been doing the Same as you for 35 Years. Let me Know if you want some Pics of my Babies! Check the Belt Tensioner. If the Tensioner is not Holding the Belt Tight Enough it will drop the Power in the Battery and Alternator. I know that I have seen these Alternators go a Lot higher than Capacity and still be Fine. I agree with you on the Dealer. Let me Know! Please Rate my Response, I need all the Help That I can Get! Thanks!

Posted on Jan 27, 2009

  • Travis Humphries
    Travis Humphries Jan 27, 2009

    No Problem! Happy To Help!

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I should make a 'slight' spark when you hook up the negative (very slight)-if it is a significant spark, you still have a drain-you can find drains on the battery by removing fuses while you have a digital voltage meter, hooked up to the battery-when you remove fuses, look for NO drop in voltage-there is your drain.

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maybe something shorting out drawing power did u have alt tested before switching out to make sure it was bad- sum auto stores such as auto zone/advanced auto can do a load test on vehicle for free will show if their is an excess draw on elect or if new alt is faulty (does happen) check serpentine belt and pulleys belt may be slipping then check ground strap , starter for draw or some other accessory

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I doubt anyone could say what it will take to fix this - this problem requires visual inspection and if that doesn't turn up obvious loose ground cable some where you'll need your volt meter.

Basics - Battery voltage is good and load tests good. A battery problem can cause weird stuff too. You might try a known good battery if no tester is available.
Hooking up jumper cables in reverse polarity can cause problems beyond imagination.

Battery voltage beyond spec's will cause the power train computer to shut down in order to protect itself - it isn't doing that, right?

Add-on equipment ? at this point if grounds and power cables/wires are not indicating voltage drops I would monitor system voltages (a scanner will do nicely here) for spikes. It has got to be a voltage problem effecting so many devices. Disconnect add-ons till you are sure they are not causing the problem.

Think about a Professional, you'll save time and money ? Good Luck

Let us know.

Dave

Mar 13, 2009 | 2005 GMC Yukon Xl Denali

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