Looking for Help!! Voltage issues 2016 International.

Discussion in 'Experienced Truckers' Advice' started by Bill15, Oct 14, 2021.

  1. Bill15

    Bill15 Bobtail Member

    1
    0
    Oct 14, 2021
    0
    I have a 2016 international Prostar. Voltage was going over 18v. Shop replaced alternator. Since than I've been having issues with low voltage now. Been in and outta shop last 3 weeks and no one can seem to find the issue but have replaced starter, batteries, connections, ext.
    I have seen on a forum here that someone mentioned in the internationals there are 2 alternators used (200amp and 300amp) is this true?
    Right now when driving it will go from 14.5 and down to lower than 10v. Will shut off as much electrical (radio, GPS, ext) and throw codes. I pull over put brakes on and high idle for few mins and will power back up. This will continue to happen. Sometimes every 5 mins sometimes will go 2hrs but then happen again.
    Electrical is a real.#### and looking for any help please and thank you.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Dockbumper

    Dockbumper Road Train Member

    3,451
    8,477
    Apr 29, 2020
    0
    I have no idea where to start. Sounds like the shop has the"keep throwing parts at it" policy. Is this your truck or a company truck? If it is a company truck, let them use the above method. If you own the truck..... Find a new shop.
     
  4. Ridgeline

    Ridgeline Road Train Member

    17,943
    76,313
    Dec 18, 2011
    Michigan
    0
    Check your grounds, all of them.

    many shops will not check the grounds or clean contact points because they don’t understand how the charging system works.
     
    Happily Retired Thanks this.
  5. Happily Retired

    Happily Retired Road Train Member

    9,085
    17,685
    Apr 16, 2014
    high plains colorado
    0
    I agree, a bad ground will do crazy things. I wouldn't trust a dash gauge as being gospel, but clearly a problem. Does the alternator get hot to the touch? I drove a Mack once, went through 3 alternators in a month, and everytime they were so hot, you couldn't touch them. A new ground to the frame solved the problem. My WS did the same thing, erratic voltage and a new ground fixed it.
     
  6. DirtyBob

    DirtyBob Road Train Member

    1,877
    1,492
    Sep 2, 2010
    Indiana
    0
    I agree with the grounds, but you definitely wouldn't be the first person to get a bad alternator from the parts department. Many times no one looks at the part that was just replaced. Happened to a buddy a couple months ago and had to do two alternator swaps on the job site that day.

    Anything smelling when this happens?
     
  7. Elroythekid

    Elroythekid Road Train Member

    1,819
    1,836
    Sep 9, 2010
    Halifax Nova Scotia
    0
    I agree with the grounds check, but, the ECM does voltage regulation now, at least on most vehicles. The sense wire back to the ecm could be bad or the ecm could have issues.

    Can we just go back to the good old days, when vehicles had and alternator, a rectifier, and a regulator, all separate?
     
    Happily Retired Thanks this.
  8. Dockbumper

    Dockbumper Road Train Member

    3,451
    8,477
    Apr 29, 2020
    0
    Wrenched on all of my cars and motorcycles my whole life. I miss the ease of troubleshooting and repairing the old stuff.
     
    Happily Retired and Elroythekid Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted