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Questions on wiring for Dual Battery setup

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7.4K views 3 replies 3 participants last post by  cierrapitchford6  
#1 ·
I've read through a number of posts on this subject. I have a 19xpt that has the factory installed busbar and a Blue Sea fuse box that all accessories are wired to. One thing that I'm not quite understanding is some kits/installs there is a wire that goes from the isolator to the ACC post of the busbar and some do not (pics are below). From my understanding that wire would be to power the isolator so that the accessory (2nd) battery is on and accessories connected to it can be used when key is ON but machine doesn't have to be running. So my questions are:

1) What is that wire really doing and if not used and you simply run a positive cable up to front for a secondary power post how does that change the system setup, accessory power is always there even when key is off?
2) For those that have factory installed busbar, I'm assuming you're just throwing in another power post next to busbar and having all accessory power routed to that correct? The Blue Sea fuse box power lead in my case.
3) Whats the different of running a circuit breaker from the isolator vs a large inline fuse on the power wire thats running up to front of vehicle.

There seam to be a lot of people running the TrueAM kit so looking for any feedback. Thanks

Has wire:
Image


Doesnt appear to have wire:
Image


Image
 
C
#2 ·
I'm not a fan of dual battery setups with different batteries so I've never personally tried this with mine, but I'll try and answer your questions the best I can.

1) The isolator is essentially a relay. The small wire is used as the trigger to connect the batteries so that the charging system connects to both batteries. Some of the fancier isolators will also have voltage sensing and disconnect if the voltage drops too low on the main battery source as well. The pics you posted without a wire, actually do if you look close. I added yellow circles to them in the pics below to highlight.

2) In most of the cases I've seen, the secondary battery is used as the source for a new buss or fuse box like a BlueSea. If you were to wire back to the factory buss, I'd just remove the original 12V battery and ground wires and replace with connections from the secondary battery. That way you still have 12V ignition for trigger source and draw power for accessories of the secondary battery.

3) The only difference is that a fuse blows and needs replaced and a circuit breaker can be reset when it pops. They make fast and slow break for both. Where you put it in the circuit doesn't really matter, but best practice is as close to the source as possible as anything from the source to the fuse/breaker isn't protected.
 
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