1800 watt Inverter drained battery while driving?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Xenergiserx, Sep 15, 2021.

  1. Xenergiserx

    Xenergiserx Light Load Member

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    Was the truck supposed to die if I take off a terminal?
     
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  3. Six9GS

    Six9GS Heavy Load Member

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    IDK. Most cars won't die if unhook the battery, but some cars will. I don't know enough about truck electrical systems to know. Sorry.
     
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  4. Snailexpress

    Snailexpress Road Train Member

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    It's will not kill batteries but create resistance in circuit and starter will not crank.
     
  5. Snailexpress

    Snailexpress Road Train Member

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    Depends on terminal. If you disconnected power to truck computers it will die.
     
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  6. Snailexpress

    Snailexpress Road Train Member

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    If you want best advise post your truck make, model, year. Pictures will tell a lot.
     
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  7. skallagrime

    skallagrime Road Train Member

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    1, replace batteries, having known good batteries is a must going into winter (technically more for running in the cold, but peace of mind on the road is priceless too)

    2, test alternator, if its actually pushing 15 like you say, replace immediately
     
  8. Xenergiserx

    Xenergiserx Light Load Member

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    So I bought 4 new batteries. Disconnect the fridge. Until I get out of California.
    And it runs at 14.2 v. Not 15. Thanks guys for your help and helping a rookie. Owner. Didn’t sleep last night working on the truck.
     
  9. skallagrime

    skallagrime Road Train Member

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    Welcome to the life

    Next step, trace every single big wire, inspect all ends for cracked/corroded lugs, and ideally measure voltage drop end to end to make sure its not corroded in the middle.
     
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  10. Final Drive

    Final Drive Road Train Member

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    You can have your voltage in range but if your alternator is not putting out enough amperage
    It won't maintain the draw on your battery's that your inverter is putting on them...
     
    mtoo Thanks this.
  11. Old Man

    Old Man Road Train Member

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    Everyone is overthinking this, batteries die, sometimes very quickly.
    Just run the truck and see how it performs.
     
    Rideandrepair Thanks this.
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