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Procedure to hook up AGM batteries?

warbler_roadwarbler_road Member Posts: 83
in Battery/Electrical & Solar
Got two fresh 6V AGMS, hooked them up in my 400 exactly as the previous ones were, with battery switch off, shore power unplugged, solar covered. Attached positive cable to battery 1, then jumper from battery 1 neg to battery 2 pos, but when I touch negative cable to battery 2 neg, there is a BIG spark. Too big. Does the inverter need to be cut off somehow? What is pulling all this power?

Thanks!
  • Virginia
  • 2020 T@B 400
  • 2018 Tacoma SR V6 3.5L
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Comments

  • pthomas745pthomas745 Moderator Posts: 4,148
    Sparks are normal.  "BIG" sparks that singe your hair off?  If you hesitate with the connector just hanging loosely around the battery terminal, they will spark a bit.  As pointed out in your other thread, just confirm your wiring is correct.
    2017 Outback
    Towed by 2014 Touareg TDi
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  • warbler_roadwarbler_road Member Posts: 83
    Thanks @pthomas745; I will try again today. I also should have just stuck with the other thread so feel free to pull this one.
    • Virginia
    • 2020 T@B 400
    • 2018 Tacoma SR V6 3.5L
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  • Yoshi_TABYoshi_TAB Member Posts: 471
    edited March 2023
    Hi,

    Hooking up a battery with an inverter in the circuit can produce a larger than "normal" spark than attaching the cables with no inverter.  The capacitors in the inverter if not drained, hold a charge which results in a large spark.  There are easy ways to precharge your inverter to reduce or minimize the spark, either with a resistor, incandescent light bulb and  even a pencil will work. The bigger the inverter the bigger the spark.  Your fine with the size inverter in TABS..just be prepared.     Inverter has a Spark with Battery Connection - YouTube
    2025 360 CS (awaiting delivery)
    2021 TAB 320 BD (w/new owner having fun)
    2021 Jeep Grand Cherokee
    Southern Maryland
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  • warbler_roadwarbler_road Member Posts: 83
    @Yoshi_TAB I had read yesterday on an Airstream forum about the inverter capacitor surge, but didn't want to get into trial-and-error with my camper.

    BUT THE PENCIL WORKED! Thank all of you. :-)
    • Virginia
    • 2020 T@B 400
    • 2018 Tacoma SR V6 3.5L
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