1800 watt Inverter drained battery while driving?

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

  1. Patriot_Bearing_Supply

    Patriot_Bearing_Supply Bobtail Member

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    Sep 25, 2019
    Cleveland Ohio area
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    Most likely one or more of the batteries had a shorted cell. Truck batteries are wired in parallel, a bad battery will pull the other ones down. As far as removing a cable from the battery with the vehicle running, NEVER do this. People did it to "test the generator" on old cars. The practice has been passed down the generations. Alternators have been in use since the mid 60's, probably a little later on heavy vehicles, they always change over later for things. Batteries act as a reservoir / electrical sink, removing that from the circuit while the alternator is running, causes voltage spikes and overloads the alternator. It can kill an alternator instantly.
     
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  3. Xenergiserx

    Xenergiserx Light Load Member

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    Feb 2, 2021
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    Well thanks everyone. I cleaned all terminals and drop test all cables. The problem was the starter motor ! It was on his last legs! Tech said it had water damage and was cracking slow. Put a new one in. And boom so the truck had power it was the starter draining the batteries. Thanks you guys for your time and help!
     
    uncleal13 Thanks this.
  4. skallagrime

    skallagrime Road Train Member

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    Apr 10, 2012
    Indiana
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    Slow starter will do that, takes Juice to crank, the more time it cranks, the harder it is on batts.

    Starter being too slow to get compression fast enough is unpleasant cause it has you looking elsewhere
     
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