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Can dual battery system affect the computer/electronics?

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  • Can dual battery system affect the computer/electronics?

    This may be a dumb question but:

    General advise is that jump starting with modern vehicles can cause some sort of electrical spike which can then damage onboard computers and other delicate electronics. If this is the case, then what is the difference between that scenario and having a second battery connecting via a solinoid?

    Can a dual battery system damage the ecu and other electronics?

  • #2
    As far as i am aware i dont think its possible.

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    • #3
      I'm not sure if they can spike the electronics or not, but if you chase Piranah on Youtube, Allan suggests that it can.
      Bazza
      [i]I'd rather laugh with the sinners than cry with the saints![/i]

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      • #4
        I think the main difference is with the solenoid you are only connecting another battery, not connecting another battery with an alternator charging it and another electronic system on the other end (another vehicle).

        Never heard of a dual battery system affecting the ECU, of course a bad instalation of any system might cause issues; but a well installed system should be fine.

        Cheers Andrew
        [COLOR="#FF0000"]So Long and Thanks for all the Fish![/COLOR]

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        • #5
          Hi Wil and you will not damage your ECU or anything else in your vehicle.

          There is some deliberately misleading advertising used to sell isolators, where the sellers try to make out you risk damaging ECUs and the likes, if you don’t use their isolators with it’s built in spike protection, but this is complete scotch mist.

          You will not spike anything, even when jump starting, it just doesn’t happen.

          What can happen, and know-it-all know nothings will claim spikes caused an ECU to be damaged during a jump start, is if the ECU is in the middle of carrying out some electronic chore when the ECU is “STARVED” of power for a second or two, while you trying to start a motor off a near flat battery and this can cause the ECU to freeze or something similar.

          But this type of failure can usually be fixed with a reboot, which means the ECU was not damaged at all.

          If something is spike damaged, it is totally stuffed but it’s only likely to happen to electronics connected to AC mains during a lightning strike, and is not something that is going to happen in your vehicle’s 12v system.
          drivesafe
          Senior Member
          Last edited by drivesafe; 28-02-2013, 12:55 AM.

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          • #6
            Don't forget drivesafe that most of the so called 'spiked electronics' have been spiked because they connected up the jumper leads back to front ( but wont admit it)
            2012 Graphite GXL T/D Auto, with all the normal crap you fit

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            • #7
              Hi Bear and reversing the polarity is still not a spike but your probably correct in that people will not admit to the mistake and simply say it was spiked

              BTW, I work around all sorts of RVs from 4x4s and camper trailers, right up to high end motor homes, and I see and have to repair a lot of equipment damaged by persons connecting up batteries in reverse polarity.

              9 out of 10 occasions, the damage was NOT done by the owner but is done by service people.

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              • #8
                I worked in a car yard for 4 years (Toyota) and couldn't tell you the amount of times I had jumped a vehicle, wether it was an 80 series cruiser, lexcen (commodore) camrys, taragos etc and it would have been a daily chore and we just used the old battery on a wooden bottom added to it but on a trolley (the type you moved a fridge with) with shitty old jumper leads and certainly didn't have any spike protection, only spikes were from the rotted timber base in the ankle, and must say in that time I never heard of any of the vehicles getting spiked..........Cheers Steve
                Face lift 150 Prado V6 auto. No mods yet

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                • #9
                  Steve I agree. I used to run a team where we worked on new vehicles and at any one point would have around 1 billion dollars worth of new cars in the yard. The yard staff would jump start anything from a Toyota Mitso Sabb Trucks and list goes on. Never had anything get damaged in eight years.

                  An old 'Trick' is once the car has started turn on the headlights before removing the jump cables. Theory is power like humans is naturally lazy so the 'spike' would travel to the headlight and dissipate. Eight years of not doing that and guess what no damage to any ECU that I was aware of and I would have known considering the cost.

                  Hazza
                  Silver 120 Series Diesel GXL 2009 with Option Pack 2, king Springs 2" Lift with 'H' front spring, MT ATZ 4-RIB, Dual Battery, Deluxe ARB Bull-bar, Winch, Towbar, Anderson 50 amp plug at the rear, Weather Shields, Bonnet and Head Light Protectors, Rubber Mats inc Cargo mat, UHF Ariel, Portable Uniden UHF plugs into areal, On-board ARB Compressor, Brains Black Box TG150 Protector, Rear Black Duck Seat Covers.

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                  • #10
                    Originally posted by drivesafe View Post
                    Hi Bear and reversing the polarity is still not a spike but your probably correct in that people will not admit to the mistake and simply say it was spiked

                    BTW, I work around all sorts of RVs from 4x4s and camper trailers, right up to high end motor homes, and I see and have to repair a lot of equipment damaged by persons connecting up batteries in reverse polarity.

                    9 out of 10 occasions, the damage was NOT done by the owner but is done by service people.
                    Years ago i worked at a major country dealership that had 5 different franchises , the RAC had pretty well most of the contracts for call outs on new cars , there was 1 old bloke (RAC contractor)who was always having trouble jump starting cars and they would get towed in , Anyway nearly every time you could see that he had connected up the jump leads back to front (this was when the positive lead on some cars became black with a white tracer), blown main fuses and alternators , but he always insisted he didn't
                    2012 Graphite GXL T/D Auto, with all the normal crap you fit

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