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Thread: Dead DB isolator

  1. 12th February 2015, 12:48 PM #1
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    Dead DB isolator

    Been having problems with my aux. 105ah battery not keeping charge after almost nil usage, replaced the 7 1/2 yo start battery a month ago so its not that. Today managed to get out with the multimeter and check where the problem is, no power led at the power socket in the rear of car and measured further up the line i only get a little over 9V.
    Measured terminals of aux and still only 9.26V and same at the output terminal of the Piranha isolator, with engine running i get 14.52V at the start battery and engine off 12.83V.

    Time for a traxide upgrade i think.
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  2. 13th February 2015, 01:37 PM #2
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    Which pirahna isolator do you have, Nick

    I have had one for 16 years and still works great.

    Check the earth wire is connected properly.

    Hows your ankle going?
    Neale

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  3. 13th February 2015, 04:46 PM #3
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    Quote Originally Posted by Corgie Carrier View Post
    Which pirahna isolator do you have, Nick

    I have had one for 16 years and still works great.

    Check the earth wire is connected properly.

    Hows your ankle going?
    Good Neale, check out general chat - will check the earth.
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  4. 16th February 2015, 04:06 PM #4
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    I cleaned up and relocated the earth lead, now with the ignition on but engine not running i get nil voltage at the aux. battery lead as disconnected from battery.
    Tomorrow i will test with engine running to see if that makes a difference but i assume that i only need the circuit to be joined to get a voltage reading ?
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  5. 17th February 2015, 12:12 PM #5
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    The lead will need to be connected to the battery as the computer can't detect a source so won't allow and current through.
    Neale

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  6. 17th February 2015, 04:18 PM #6
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    Quote Originally Posted by Corgie Carrier View Post
    The lead will need to be connected to the battery as the computer can't detect a source so won't allow and current through.
    Thanks Neale, i charged my aux. batt up and it now reads 13.12V so how can i tell if the isolator is sending the correct voltage to it ?
    My alt is putting out 14.52V so should i see this at the output terminal of the isolator and or battery ?
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  7. 17th February 2015, 07:14 PM #7
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    Hi Loanrangie, with the motor running and both batteries connected to the isolator, you should see the same voltage on the input and output terminals of the isolator, at the isolator.

    For Land Rover Specific Dual Battery Systems and Headlight Wiring Upgrade Kits,
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  8. 17th February 2015, 08:19 PM #8
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    Is your main battery above 12.8? I think that is the point at which the controller sends all the charge to the aux.

    Run a load off the aux battery till it drops and then run the car and you should notice if the controller is working or not.
    Neale

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  9. 17th February 2015, 08:23 PM #9
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    Quote Originally Posted by drivesafe View Post
    Hi Loanrangie, with the motor running and both batteries connected to the isolator, you should see the same voltage on the input and output terminals of the isolator, at the isolator.
    With the pirahna controllers the measurements have to be taken at the batteries as the units are sealed.
    Neale

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  10. 17th February 2015, 09:36 PM #10
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    Hi Neale and thanks, I should have stated test the cables, not the terminals.

    With the Pirahnas, I like to push the probe into the insulation of the input and output cables at the isolator.

    The idea is to see if the problem is specifically the isolator, or possibly somewhere else in the system.

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