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Alternators: brushed or brushless

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mhyn, Sep 18, 2019.

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  1. Sep 18, 2019 #1
    mhyn

    mhyn Road Train Member

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    We know before all alternators had brushes. The lifespan of brushes were ~100k miles. Then Delco started making brushless alternators for trucks. Looks like now we are going back to brushed alternators. New materials of brush-ring pair allowing alternator go beyond 500k miles. Brushed alternator has higher output when engine is idling, small sized, light, fuel saver and it's twice cheaper. New Cascadias (and almost all Freightliner branded trucks) are coming with brushed Delco alternators installed. Bosch has Long Haul line of brushed alternators. Volvo trucks also have brushed alternators now.
     
    mhyn, Sep 18, 2019
    mhyn, Sep 18, 2019
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  3. Sep 18, 2019 #2
    uncleal13

    uncleal13 Road Train Member

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    Seems to me, we use to repair alternators that had brushes. Now we just trade in the core.
    Might be cheaper to maintain.
     
    uncleal13, Sep 18, 2019
    uncleal13, Sep 18, 2019
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  4. Sep 18, 2019 #3
    mhyn

    mhyn Road Train Member

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    mhyn, Sep 18, 2019
    mhyn, Sep 18, 2019
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  5. Sep 18, 2019 #4
    jamespmack

    jamespmack Road Train Member

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    jamespmack, Sep 18, 2019
    jamespmack, Sep 18, 2019
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  7. Sep 18, 2019 #5
    mhyn

    mhyn Road Train Member

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    yes. it's not brushless. it's brushed alternator. All new trucks comes with this alternator(or equivalent). Mostly 200A rated. Brushes are made from new materials and they last very long. No need for external fan.
     
    mhyn, Sep 18, 2019
    mhyn, Sep 18, 2019
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  8. Sep 18, 2019 #6
    speedyk

    speedyk Road Train Member

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    The brush/brushless thing may or may not be good; I'd want to see them put a replacement set on the counter so I could see how hard they are to replace early, which I would likely do because I'd rather do it when I choose to, given what roadside repairs can cost.

    If they had them I'd probably buy them along with the alternator.
     
    speedyk, Sep 18, 2019
    speedyk, Sep 18, 2019
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  9. Sep 18, 2019 #7
    jamespmack

    jamespmack Road Train Member

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    They have two internal fans and function as any other alternator. Not much special about them. They dont last much longer. The conceived to make a product cheaper and lighter that your happy to pay more for. That's all they have accomplished.
     
    jamespmack, Sep 18, 2019
    jamespmack, Sep 18, 2019
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  10. Sep 18, 2019 #8
    mhyn

    mhyn Road Train Member

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    could be. Have you used them ? I had before(more than 10 years) 28SI but it was a different alternator, different look. Lasted 180k miles.
     
    mhyn, Sep 18, 2019
    mhyn, Sep 18, 2019
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  11. Sep 18, 2019 #9
    truckdriver31

    truckdriver31 Road Train Member

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    you can rebuild brushed alt, drills, impacts. but you cant rebuild brushless stuff
     
    truckdriver31, Sep 18, 2019
    truckdriver31, Sep 18, 2019
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  12. Sep 18, 2019 #10
    swaan

    swaan Road Train Member

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    Why rebuild them. There cheap enough and last long enough. Just replace when needed. Heck , for 250 bucks carry a spare.
     
    swaan, Sep 18, 2019
    swaan, Sep 18, 2019
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