Another Trailblazer deep cycle battery question




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  1. #1
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    Default Another Trailblazer deep cycle battery question

    Hi

    I am a bit confused. The National Luna isolator installation booklet says the negative wire of the deep cycle battery must be connected directly to the negative of the main battery. From posts on this forum it seems it must rather be connected to the battery earth point next to the battery? The internet has various opinions. Is there any diffirence? Which is the correct method?

    Thanks!
    Last edited by Brent; 2017/02/25 at 09:10 PM. Reason: Confusing text

  2. #2
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    Default Another Trailblazer deep cycle battery question

    Brent definitely + to + and - to - . Negative on the earth at the chassis.
    50amp fuse on positive line
    I am considering to install a DC to DC charger instead of the NL solenoid. Had some issue last year, lost my main battery in the Kgalagadi due to over charge. Not sure if the 2nd battery was the culprit. No one can tell me. I am in 2 minds.
    Last edited by Uys Snyders; 2017/02/25 at 10:28 PM.
    Uys Snyders

    Trailblazer 2.8DuraMax
    Bushlapa Vlooi B237

  3. #3
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    Default Another Trailblazer deep cycle battery question

    Brent sorry just read your post again. The negative must be connected to the negative earth at the main battery on the chassis. This has to do with the variable alternator in the TB.
    Last edited by Uys Snyders; 2017/02/25 at 10:28 PM.
    Uys Snyders

    Trailblazer 2.8DuraMax
    Bushlapa Vlooi B237

  4. #4
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    Default Re: Another Trailblazer deep cycle battery question

    Thanks Uys! Appreciate the reply. First ' straight' answer I could find!

  5. #5
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    Default Re: Another Trailblazer deep cycle battery question

    Pleasure Brent. I have also sent you a PM.
    Uys Snyders

    Trailblazer 2.8DuraMax
    Bushlapa Vlooi B237

  6. #6
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    Default Re: Another Trailblazer deep cycle battery question

    Hi Uys

    Just read how the variable voltage on the TB causes the AUX battery to not charge to it's full capacity.

    A solution offered is to have a DC-DC charger in front of the AUX battery.

    Would you agree with this?

    Thanks.

  7. #7
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    Default Re: Another Trailblazer deep cycle battery question

    Festi1 yes I agree with that. DC2DC charger is the best option/route to take, in my opinion, if you want to charge the battery from your car.
    Due to the cost of such units, I, for now, opted not to put my 2nd battery in the car. I am going to put it in my Bushlapa and charge it from the solar panel on the roof while driving. I do have a BH in the back of the TB connected to the front battery and will use that to supply the fridge with power while driving.
    Maybe not the optimal solution but I want to get rid of the 2nd battery inside the car.
    Uys Snyders

    Trailblazer 2.8DuraMax
    Bushlapa Vlooi B237

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