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  • Earthing Dual Batteries and Winch

    I have found it difficult to see how the car is earthed. Wondering if the body and/or chassis have a healthy earthing somewhere that I can't see. I am in the process of wiring my winch and a duel battery system. The negative wire on the original battery seems a bit puny so I wonder if it is safe to run a winch other than using a direct to battery negative connection. In the same vain how are people making an earth connection for a second battery
    2009 120 GXL D4D, TJM Bull Bar, Winch, Safari Snorkel, ARB Lift, ARB Lockers, Black Widow Drawers

  • #2
    I would always connect a winch directly to the battery both +ve and -ve.
    [url=http://www.myswag.org/index.php?topic=12264]My Prado[/url]

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    • #3
      100% agree, especially with something that has as much draw as a winch, run positive and negative straight back to battery. Even the second battery is best earthed off the main battery
      My Rig: 150 GXL D4D, Tough Dog adjustable suspension with 60mm lift, Polyair bags, ARB Winch Bar, Warn Winch with Dynamica Rope, Outback Ideas recovery points, GME UHF, HID Low/High Beam, Lightforce Genesis HID Spots, Dual Battery Setup with rear power outlets, ARB air compressor in engine bay, ~30L Watertank mounted behind fueltank.

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      • #4
        As above always run directly to batt
        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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        • #5
          Agreed! Due to the current draw of a winch you should always wire directly to the auxiliary battery or main if you don’t have one.

          When wiring the dual battery run the earth directly battery to battery. Best results use large wire and there is plenty of information on this in the forum. With the wire 'bigger the better'.

          http://www.pradopoint.com/showthread...ighlight=hazza


          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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          • #6
            Thanks team Pradopoint.
            2009 120 GXL D4D, TJM Bull Bar, Winch, Safari Snorkel, ARB Lift, ARB Lockers, Black Widow Drawers

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            • #7
              You'll find 35mm welding cable is more flexible, easier to work with, and has a better protective sheath, it is more expensive though.
              [url=http://www.myswag.org/index.php?topic=12264]My Prado[/url]

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              • #8
                The winch should be connected to the main battery and use a battery management system (solenoid) to connect both batteries if you need the extra amps. The engine should always be running when winching, hence connecting to the main battery. The aux negative is connected directly to the main battery negative post. No need to earth the aux to the body. Big cables as per D4D comments. I also have a large amp capacity isolator under the bonnet to cut the power to the winch when not in use.
                Dave
                Views expressed are mine alone and are not intended to compromise the integrity of my employer nor offend those who may read such views.
                Bugger Bali, get out and see Australia before we sell it all to China.

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                • #9
                  Thanks for the comments. I was thinking of using a 500a relay with in-cabbin switch to join the batteries under my manual control but talking to an auto electrician he tells me that on a "modern" car the alternator will possibly cook itself if it is charging two flat batteries at once and he is quite sure a redarc is the go so that there is no possibility of this happening.
                  2009 120 GXL D4D, TJM Bull Bar, Winch, Safari Snorkel, ARB Lift, ARB Lockers, Black Widow Drawers

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                  • #10
                    Originally posted by Mule View Post
                    Thanks for the comments. I was thinking of using a 500a relay with in-cabbin switch to join the batteries under my manual control but talking to an auto electrician he tells me that on a "modern" car the alternator will possibly cook itself if it is charging two flat batteries at once and he is quite sure a redarc is the go so that there is no possibility of this happening.
                    Sorry to say your mechanic is wrong here. Tons (me included) are running factory alternator with two batteries without issue. If you have trouble charging,you can go for a $40 diode that will increase your alternator output sufficient enough to charge both batteries from flat. Do some research and save some coin.
                    My Rig: 150 GXL D4D, Tough Dog adjustable suspension with 60mm lift, Polyair bags, ARB Winch Bar, Warn Winch with Dynamica Rope, Outback Ideas recovery points, GME UHF, HID Low/High Beam, Lightforce Genesis HID Spots, Dual Battery Setup with rear power outlets, ARB air compressor in engine bay, ~30L Watertank mounted behind fueltank.

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                    • #11
                      Agree with above. Earth to battery.

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                      • #12
                        interesting how everyone says to take the earth back to the battery.
                        I've connected mine the chassis, undo a bolt put a connector in tighten it back up both winch and dual battery haven't had any issues, is there really that bigger difference in current draw?
                        just curious as I've always been told to earth to the chassis, might learn something new.

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                        • #13
                          Often the factory earth lead to the body is not heavy enough to take the load of a winch. I have seen a factory earth lead melted when the winch earth was fixed to the body. Also over time connections can deteriorate (eg, salt corrosion) and create resistance putting load on the smaller wire. Running directly to the battery bypasses any possible problems now and the future.

                          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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                          • #14
                            righto more things to tinker with.
                            I've always put a coat of silicone over where I've connected to the chassis to protect it from corrosion.
                            but it never occurred to me check the earth cable for the battery.

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                            • #15
                              The problem with not earthing the winch directly to the battery and to the chassis instead is what happens if something is not quite right, such as earth lead is loose, or a bit corroded or falls of altogether. The current will do anything it can to find Earth, and that might mean large loads going through wires that can't handle it and results in melted wiring loom! Very expensive.

                              On a similar note, I have seen the result of a poor Earth connection when welding on fixed plant and insted of earthing through the welder cable it earths through the wiring for electric motors and power outlets, lets just say its not pretty and bloody expensive.

                              The Earth side of any electrical setup is just as important as the power side as far as quality and cable size goes, so many electrical faults are caused due to poor earth connections.

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

                              [url=http://www.4wdadventurers.com/showthread.php?3840-AJ-s-120-Prado]MY PRADO AND DIY CAMPER TRAILER[/url]

                              [url=http://www.4wdadventurers.com/showthread.php?3975-AJ-s-79-series-Cruiser-Ute]MY HZJ79 Landcrusier[/url]


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