Batteries test okay, but…cranks slow.

Discussion in 'International Forum' started by tarmadilo, Feb 1, 2024.

  1. tarmadilo

    tarmadilo Road Train Member

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    I’m driving a 2019 International RT with 430k on it, and it’s acting like it needs new batteries. Cranks slooow (but so far has started), and my APU runs constantly whenever I turn the engine off. Mechanic tells me that he checked the batteries and starter and can’t find anything wrong. Thoughts?
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    If it cranks slow, and batteries and cables are good, it needs a starter.

    I'm curious how the "mechanic" checked them
     
  4. tarmadilo

    tarmadilo Road Train Member

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    I’m not sure. All I know is that I told them that the APU seems to think that there isn’t enough charge on the batteries, because it kicks in immediately when the engine is turned off.
     
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  5. Hammer166

    Hammer166 Crusty Information Officer

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    I bet one of those batteries will fail the eyeball test and will be swelled up.
     
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  6. bad-luck

    bad-luck Road Train Member

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    Check all the battery cables, make sure they are tight, and corrosion free. If they are corroded, clean them with a wire brush and baking soda and water or any battery corrosion cleaner. Check battery cables for the same at the starter. This is very easy to do, I would start there.
     
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  7. JonJon78

    JonJon78 Road Train Member

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    This thing works well and is inexpensive. A bad/failing APU alternator could be draining everything as well, how old is the one you have?

    Screenshot_20240201_150424_Chrome.jpg
     
  8. uncleal13

    uncleal13 Road Train Member

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    Earlier International Prostars were famous for having crappy battery cables / unprotected / not much insulation.
    Don’t know if the newer models have the same issue.
    I had a truck that the starter seemed to drag, found it was the main battery ground on the frame.
    Another truck right from the manufacturer: they put masking tape on the frame ground stud before painting, but never removed the tape before the wire was tightened down. Over a couple of years the tape deteriorated leaving the ground wire a little bit loose.
     
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  9. tarmadilo

    tarmadilo Road Train Member

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    Well, this is happening at the Ryder shop (it’s a leased truck), and that first mechanic went home at the end of the early shift. Now we’re starting over with a late shift fellow.
     
  10. tscottme

    tscottme Road Train Member

    A poor/dirty cable connection between any component will seem like a dying battery. Clean off every connection and check for low resistance and good continuity.
     
  11. flood

    flood Road Train Member

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    Could be a bad diode in the truck alternator...
    It'll charge just fine but when you turn it off power will back flow thru it..
     
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