voltage question

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Northstar Engines and System Technical Discussion Discussion, voltage question in Cadillac Engine Discussion; dashboard info shows 13.5 volts while driving but quickly drops to around 12 at idle...
  1. #1
    ppsager is offline Cadillac Owners Member
    Automobile(s): 98 deville
    Join Date
    Jul 2013

    voltage question

    dashboard info shows 13.5 volts while driving but quickly drops to around 12 at idle

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install 26 inch wheels
    Automobile(s): 2002.5 F55 STS - 66500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: voltage question

    No good.

    DIC should show 14.2 - 14.6 at speed, maybe 13.8 stopped with loads on.

    Cables; how old is the battery ?? (Any more that 6 years old, the battery is suspect, as is the voltage regulator - inside the alternator)

    Battery voltage chart - battery completely disconnected and left to sit for at least 1/2 hour.

  4. #3
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Dallas, TX

    Re: voltage question

    My alternator did this before it died. If you have a healthy battery, it might be on its last legs, especially considering age and mileage of these vehicles.

  5. #4
    04GrandAmGT's Avatar
    04GrandAmGT is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DTS, 04 Grand Am GT,07 Cobalt(Dont Judge,My fuel Saver)
    Join Date
    Oct 2012
    Manitoba, Canada

    Re: voltage question

    Yes i agree with maeng9981, i Drove jake 97 eldo, and he had an aftermarket alternator, and if you didnt shoot the rpms to 5000 as soon as you fired it up it wouldnt charge at all! even driving on the highway all of a sudden everything gets dim check your voltage and was about 12.1, throw it in neutral and shoot it to 5000 again and you were good to go for a little while, if you can spare the extra money get a Factory Replacement! its worth every penny seeing as it is about a 1-2 hour job for a novice northstar mechanic.

  6. #5
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007

    Re: voltage question

    Also check the main "hot" connection at the alternator

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