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Discussion Starter #1
I do a lot of boondocking with my truck camper. With my past trucks, I wired a charging cable directly from my truck battery to my camper batteries with a quick disconnect where the wiring met the camper.

Since there are two batteries on the Titan, I have to ask.... Which battery should I wire my camper to? Or, does it even matter?
 

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I do a lot of boondocking with my truck camper. With my past trucks, I wired a charging cable directly from my truck battery to my camper batteries with a quick disconnect where the wiring met the camper.



Since there are two batteries on the Titan, I have to ask.... Which battery should I wire my camper to? Or, does it even matter?


What year is your camper because most campers batteries charge when you plug your trailer into your truck through the factor harness.
 

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I do a lot of boondocking with my truck camper. With my past trucks, I wired a charging cable directly from my truck battery to my camper batteries with a quick disconnect where the wiring met the camper.



Since there are two batteries on the Titan, I have to ask.... Which battery should I wire my camper to? Or, does it even matter?


And it probably won't matter which battery you use on the XD.
 

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I was asking myself a similar question for my ARB Fridge... But I have yet to find time to get to it...

If the batteries are in parallel (12V), ie, + connected to + and - connected to -, then put your + on one battery and the - on the other and you should be fine.
 

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Discussion Starter #5
The factory camper wiring harness does allow the batteries to charge while plugged into the truck, but the wires are so small that the voltage they carry is minimal. So, I use much heavier cable with a 40 amp fuse and can charge/recharge my batteries rapidly. I do know how to wire my batteries, my question was if it matters which battery on the Titan I should hook my cable to....
I know they both charge off the alternator, but is one of the Titan batteries for "accessories" and one for starting? Is the starter battery protected from draining past a certain point so you can always start the truck? if so, i don't want to wire to that battery and risk a non-start situation some day....
As a point of info, I usually make it a point to electrically disconnect my camper from the truck when i get to my boondocking location so I don't drain the truck battery inadvertently...but sometimes things happen....

So, what does everyone think...connect to the drivers side battery or the passenger side battery?
 

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Which ever is easier for you, their in series. There is no isolator they both are in use at the same time. No start and house just one big battery.
 

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XD storage question with battery tender

I have a different question on a similar topic.

I am about to store my XD for the next 4-5 months and wanted to leave it plugged into a battery tender in my garage. The previous post states that the batteries are in parallel, which I assumed they were. I just want to confirm again that it doesn't matter which battery I connect the battery tender to. Is there anything else I should be doing or just set and forget? Thanks in advance.
 

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I have a different question on a similar topic.

I am about to store my XD for the next 4-5 months and wanted to leave it plugged into a battery tender in my garage. The previous post states that the batteries are in parallel, which I assumed they were. I just want to confirm again that it doesn't matter which battery I connect the battery tender to. Is there anything else I should be doing or just set and forget? Thanks in advance.
Set it and make sure the tank is full of fuel. 4-5 months isn't really a big deal, they can sit on the dealers lots for alot longer.
 

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Seems there are two versions of information on this post, are the two batteries wired in parallel or series, I have the gasser, so I only have one battery. One poster says parallel one says series, you need to know. If batteries are in series, you have a 24v system with whatever cracking amps are listed on one battery, if in parallel, you have a 12v system with double the amps listed on one battery. Like I said, mine is gas, so I'm not familiar with the set up on the diesels. My big diesels at work are 24v systems, my smaller ones are paralleled 12v for higher cracking amps.
 

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Diesel has 2 12V batteries on parallel. Gas has just the 1 12V battery. Both vehicles have 12V systems. No XD has a 24V system.

As for which battery to wire from, just use whichever one is easier to get to from a wiring standpoint; it won't matter to the electrical system.

For the person who is also storing the XD for several months, you may also want to pull the shorting (shipping) pin in the fuse block behind the glove box door to put the truck in an ultra-low current state, so that you have fewer modules (only the essentials to drive) pulling current in sleep mode. This will allow the battery tender to do less work over time. Just remember to push the pin back in when ready to use the truck again.
 

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Which ever is easier for you, their in series. There is no isolator they both are in use at the same time. No start and house just one big battery.
Oops The batteries are not wired in series, that would result in 24 volts coming from them not 12, when the truck is running they operate in parallel resulting in a larger capacity but still just 12 volts.

Sent from my SM-N960U using Tapatalk
 

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It's possible to wire direct to battery but I would recommend using an automatic charging relay that has a low-voltage isolate function, so that it will disconnect the truck from the trailer before there is too little left to start the truck.
 

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Our batteries are in parallel. I have measured current flowing to/from each battery for any particular load or charge and have determined that they are not balanced. In parallel, ideally the load should be supplied equally from each battery, it is not. The difference can be substantial, especially when starting. Same with charge current--one battery is always favored over the other. Voltage at the battery terminals generally remains the same, but current flow through each does not. I am from a school that seeks to balance batteries in any given situation where they are connected in a bank. I'm not interested in dealing with that on this truck.

For the shorter term, putting either battery on a Minder by connecting the (+) to the (+) of one battery and the (-) to the other battery or connecting the Minder to a single battery isn't going to make that much difference. Technically speaking, how the batteries are connected and a charger to the bank does make a difference in the longer term. It can be mitigated somewhat by interchanging the batteries' positions every so often, but I'm not even interested in doing that.

On my Powerstroke running dual service deep cycle/starting AGMs it's the same thing with the imbalance. I condition them IAW battery mfr procedure separately every so often when it looks like one is not holding the same charge as the other and most recently interchanged them a second time in 8 years. Usually, it's one battery dragging the other down after some time in that unbalanced situation. The conditioning process corrects that. I seek to keep them within 100mv of each other after a 24 hour resting (no charge and no load for 24 hrs). They will be starting their 9th year in service in January.

One other note is that these OEM flooded batteries are not intended for cycling use as in operating DC loads in a camper, etc. They are starting batteries only. After a small number of deep cycles, they will be toast.

In many if not most cases where it's simply a charge line running from the truck (e.g., 7pin) to the RV, the truck batteries and RV battery are connected in parallel without an isolator, but there is usually a relay with a factory towing package that energizes the charge circuit to the RV through the 7pin when the ignition is ON.

When the truck is OFF, if the RV pigtail is still connected to the 7pin, the truck batteries should be out of the circuit truck because the relay is not energized. This charge line is so long and AWG so small, that the max charge you will see through it is 3 to 6 amps depending on a few factors. This line is intended only for keeping fully charged batteries topped up while in transit to/from your destination. If the RV batteries are fully charged you will see lesser current if no lights, etc are on when under way. You will also often see a substantial voltage drop between the truck's battery terminals and the RV battery terminals, maybe 14+ at the truck battery and in the 13s at the RV battery. This is not an ideal charge situation and should never be used as the primary means for charging RV batteries, especially from a deep cycle discharge.
 

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2016 Nissan Titan XD diesel. Lifted 2", 275/65r20 tko2, s&b intake, tune/deleted, straight pipe
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I do a lot of boondocking with my truck camper. With my past trucks, I wired a charging cable directly from my truck battery to my camper batteries with a quick disconnect where the wiring met the camper.

Since there are two batteries on the Titan, I have to ask.... Which battery should I wire my camper to? Or, does it even matter?
If trailer plugged in to truck, will charge camper battery that way. Both truck batteries are connected so wouldn't matter which battery you connect to.
 

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Discussion Starter #15
That tiny little wire MIGHT maintain a full battery, but really won’t charge it. I use minimum 6 gauge (usually much larger) and a winch connector to separate the camper from the truck when parked. Have now been running my XD and camper for 4.5 years and never worry about low batteries.
 
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