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Voltage drop across SBI12 terminals

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  • Voltage drop across SBI12 terminals

    I was helping out a 120 D4D owner with a charging issue of the aux battery mounted under the bonnet. I was doing some troubleshooting with my multimeter and found that there was a voltage drop between the starter and aux. I then narrowed it down to the terminals on top of the SBI12 causing the voltage drop. The voltage drop is about 0.4V when idle and 0.6V when revved to 1500rpm. Nothing was connected to the aux battery except for the voltage gauges.

    Should there be a voltage drop and if so, what is the acceptable voltage drop? In the SBI12 manual, it says that an error light will flash if the voltage drop exceeds 1V.

  • #2
    Just a relay, should be virtual no loss if it is turned on.
    HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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    • #3
      Is the SBI12 user serviceable? Or it needs replacement?

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      • #4
        Andrew are you sure that the AUX wasnt very low and pulling heaps of amps - hence inducing some voltage drop?
        Cheers
        Micheal.

        2008 GXL D4D Auto. GOING... GOING... GONE
        2015 GXL 1GD Auto. And it begins again...

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        • #5
          The owner says that the Aux was charged off an AC battery charger on the weekend, so I expect it to be pretty full. It was on the AC charger because they did some work to put a rear door light on and the aux battery went flat in the process (the install apparently took a long time).

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          • #6
            There should be no volt drop.

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