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    Redbone reacted to 1aespinoza's post in the thread Advice on Parallel Battery Charging Options with

    

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    I have never had one or seen any OEM vehicle that has one. Do it if it gives you peace of mind.

    Mar 18, 2026
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    Redbone reacted to dragon.breath's post in the thread Advice on Parallel Battery Charging Options with

    

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    You definitely need a fuse on both ends of the power wire between the two batteries. Think about it. The power wire gets chafed and shorts out on...

    Mar 17, 2026
  • R

    Redbone replied to the thread Advice on Parallel Battery Charging Options.

    Should I add an inline fuse between the alternator and main battery?

    Mar 17, 2026
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    Redbone reacted to Doxquzme's post in the thread Advice on Parallel Battery Charging Options with

    

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    ^this^ Option 1, every time (with a parallel ground).

    Mar 17, 2026
  • R

    Redbone replied to the thread Advice on Parallel Battery Charging Options.

    Should I add an inline fuse between the alternator and main battery?

    Mar 17, 2026
  • R

    Redbone reacted to 1aespinoza's post in the thread Advice on Parallel Battery Charging Options with

    

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    Option 1 Option1 works 100%. Only reason to use an isolator is if you use the system with the car off for extended periods.

    Mar 17, 2026
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    Redbone reacted to supernov4's post in the thread Advice on Parallel Battery Charging Options with

    

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    Running positive from main battery to second battery Will give you same results as Running separate power wire from alternator to second battery...

    Mar 17, 2026
  • R

    Redbone replied to the thread Advice on Parallel Battery Charging Options.

    Should I add an inline fuse between the alternator and main battery?

    Mar 17, 2026
  • R

    Redbone replied to the thread Advice on Parallel Battery Charging Options.

    I need a fuse at both ends only if I wire both batteries independently (Option #3)?

    Mar 16, 2026
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    Redbone replied to the thread Advice on Parallel Battery Charging Options.

    3. **Option #3: Don’t run batteries in parallel, connect each battery separately to the alternator.** - **Pros:** This is the most effective way...

    Mar 16, 2026
  • R

    Redbone replied to the thread Advice on Parallel Battery Charging Options.

    Mar 15, 2026
  • R

    Redbone posted the thread Advice on Parallel Battery Charging Options in Wiring, Electrical & Installation.

    Looking for advice on wiring to keep the primary/starter and secondary/accessory battery charged. I'm running them in parallel (positive to...

    Mar 15, 2026

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