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How do you wire '88 378 Batteries?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Hilltop Hustler, Jul 5, 2025.

  1. Jul 5, 2025 #1
    Hilltop Hustler

    Hilltop Hustler Light Load Member

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    Apr 29, 2023
    West Virginia, USA
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    Very embarrassing to say but I'm learning how to install truck batteries. I'm just trying to get the engine running so I can verify the oil pressure. As it stands I'm learning to weld more than I am learning how to install these.

    Does anyone have a diagram or a picture of how these are supposed to go? 20250705_160502.jpg
     
    Hilltop Hustler, Jul 5, 2025
    Hilltop Hustler, Jul 5, 2025
    #1
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  3. Jul 5, 2025 #2
    Hilltop Hustler

    Hilltop Hustler Light Load Member

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    Apr 29, 2023
    West Virginia, USA
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    Hilltop Hustler, Jul 5, 2025
    Hilltop Hustler, Jul 5, 2025
    #2
    Kyle G. Thanks this.
  4. Jul 5, 2025 #3
    Hilltop Hustler

    Hilltop Hustler Light Load Member

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    Apr 29, 2023
    West Virginia, USA
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    So uh update: the starter is AWOL. Iwas trying to use the hookups from the starter
    o_O

    Would still appreciate a diagram.
     
    Hilltop Hustler, Jul 5, 2025
    Hilltop Hustler, Jul 5, 2025
    #3
  5. Jul 5, 2025 #4
    JB7

    JB7 Heavy Load Member

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    Laurel, MD
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    Bing Videos
    Red is + and black is -

    upload_2025-7-5_18-54-58.png

    upload_2025-7-5_18-57-8.png
     
    JB7, Jul 5, 2025
    JB7, Jul 5, 2025
    #4
    Hilltop Hustler Thanks this.
  7. Jul 7, 2025 #5
    SmallPackage

    SmallPackage Road Train Member

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    Dec 20, 2019
    Marion Texas
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    If truck has four cables. Both positives go to the big stud on the solenoid on the starter. With three batteries Hook one cable to two of the batteries with one jumper. Hook the other one to the third battery by itself.
    The two negative cables either go to the big stud ground on the starter motor together or one goes to a ground stud or bolt on the truck frame. Run the one that grounds on starter to the two batteries with jumper and run the one that grounds to frame on the third single battery.
     
    SmallPackage, Jul 7, 2025
    SmallPackage, Jul 7, 2025
    #5
    Hilltop Hustler Thanks this.
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