Battries

Discussion in 'Peterbilt Forum' started by Bernard D, Dec 5, 2020.

  1. Bernard D

    Bernard D Light Load Member

    65
    21
    Jun 27, 2020
    0
    (03 peterbilt 379 old werrner truck new inframe 100.000 miles 13 speed) Got new batteries 1.5 year old ,
    new Alt.
    same 1.5 year old.
    Summertime 4 days later dead batteries ?
    Winter below 40 2 days dead.
    Hook up jumper cables and wait 2 min and bam starts right up.
    But the Alt guage shows nothing ,i give it a thump on the fuel pedal and guage gos to normal 13 to 14 and lights get brighter.
    Any clues would be appreciated.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  3. bad-luck

    bad-luck Road Train Member

    1,479
    1,851
    Nov 16, 2013
    Baltimore, Maryland
    0
    You need to check all battery connections first. Check the ground to the frame. Check starter connections. Check each battery individually. Disconnect the wires and do a load test on each battery. Check alternator connections. Check the alternator output. Lastly, just because they were recently changed doesn't mean they didn't go bad. Good luck
     
  4. Luwi67

    Luwi67 Medium Load Member

    641
    387
    Oct 24, 2012
    Long island
    0
    Also try a parasitic draw test.
     
    tj379 and blairandgretchen Thank this.
  5. StormFX

    StormFX Bobtail Member

    2
    1
    Nov 21, 2020
    0
    Find and check ALL your grounds!
    Engine to chassis
    Cab to chassis
    Batteries to chassis
    Just because a connection is tight doesn’t mean it’s making a good electrical connection.
    Checking grounds on an older truck means completely disconnecting, cleaning and reconnecting all the stacked wires, using a multimeter set on continuity is the final step.
    Make sure you have as little impedance as possible, “0” is what we are looking for.
    Verify if possible at both ends of the cable in question, it’s not uncommon for an older cable to have a break inside the jacket where you can’t see it.

    Some older style alternators have a small wire to the regulator, make sure this is making a solid connection, it is what triggers the regulator.
     
    blairandgretchen Thanks this.
  6. blairandgretchen

    blairandgretchen Road Train Member

    9,098
    39,574
    Dec 9, 2011
    South west Missouri
    0
    I dunno if it’s an option for you, but keeping a battery tender on when not in use really REALLY helps batteries.

    I just changed mine today after 3 and a half years. When the big motor isn’t turning, the generator is, and when it’s home it’s on shore power with a trickle charge.

    Interstate batteries, 950 CCA. Less CCA the better - lead plates are spaced further apart than 1000+ CCA, less chance of freeze/heat/warp/ contact.
     
    InTooDeep Thanks this.
  7. Bernard D

    Bernard D Light Load Member

    65
    21
    Jun 27, 2020
    0
     
  8. tj379

    tj379 Light Load Member

    109
    105
    Nov 10, 2019
    ontario
    0
    i had to do this a few years ago, tufned out my alternator had a bad diode and was killing my batteries
     
    Bernard D Thanks this.
  9. tj379

    tj379 Light Load Member

    109
    105
    Nov 10, 2019
    ontario
    0
    my alternator dont charge either when truck idels very liw on a cold morning, once it gets up to say 650-700 rpm it charges, but lumpin away cold at 550-6 it dont, i dont touch fuel justvwait a minute or 2 it will come up, i also replace all my batteries every 2 years no matter what
     
    Bernard D Thanks 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