How to wire up a dual battery to your Nissan Navara NP300 D23 (DIY INSTRUCTIONS)

Jamie Hazelden in engine bay


Nissan Dual Cab Fitout

Wiring up a Nissan Navara NP300 with a DC to DC Charger system can be rather straight forward. Modern vehicle are both Low Voltage and Temperature compensating. This means the vehicle can at times power down the alternator switching off standard alternators and DC Chargers.

If you love to “do it yourself” this step buy step instruction will help you with the “tricky” bits.

The best way to handle dual battery charge in new vehicles is with an ingitions switched DC Charger. In this guide we will step you through the fitting of a JTS Ute Back box with IGN override. Allthough focusing on the JTS UTE BACK, these instructions can easily be adapted to most dual battery systems.

NB: The accessories socket found in the tub of the D23 and NP300 Navara is a constant power source. Running a fridge of this socket when parked up will drain your starting battery.

The JTS DIY Cable Kit:

  • 7 mtrs 8 B&S Cable
  • Genuine Grey Anderson Plug
  • 40amp Midi Fuse
  • JTS Midi Fuse Holder
  • RS Ratchet Strap
  • Navara Fuse Jumper
  • 7 mtrs 3mm blue cable
  • Bracket’s and hardware
  • Bolts and screws
  • 5 mtrs 13mm Split Tubing

Tools required:

  • Butane torch or soldering iron
  • Wire Crimper
  • Wire Strippers
  • Assorted Zip Ties
Navara Jumper Fuse
Crimp the blue wire to the JTS Navara fuse adaptor. Remove the 10amp fuse identified above and replace into the jumper.

Finding an ignition source on your D23 NP300 Navara

Please ensure the ignition is turned off and the keys are removed from the vehicle before performing any electrical work

Remove the glove box to expose the internal fuse block. On the bottom left hand corner of this D23 is the IGN Accesories fuse. This is clearly identified on the fuse description panel. As fuses can move between vehicle models and years it is imprtant to cross check you fuse against the location diagram on the back of the glove box.

From the engine bay identify the small wiring grommet. Pass a firm non metal strip through this grommet, once through into the vehicles cabin attach the blue wire and pull through. Crimp the blue wire to the JTS Navara fuse adaptor. Remove the 10amp fuse identified above and replace into the jumper.

In the engine bay you will now have roughly 6mtrs of blue wire, leave this asside until ready.

Grab the supplied 8 B&S cable and 13mm split tubing. feed the 8 B&S Cable and the left over ignition wire into the split tubing starting from the end of the cable.

Once done feed the wiring down the LH side of the engine bay and run along the cable along the chassis to the back of the cab. In the front of the tub you will notice a wiring grommet. Use this to feed the cable through into the tub. Leave yourself roughly 1.5 mtrs sticking through. Remember to silicon up the gromet once the exact length of cable is detirmined.

Specific to the original Navara JTS Ute Back System:

The Navara DIY Ute back systems is supplied with the required mounting brackets and hardware to complete the job.

Fit the side mounting bracket to your Ute Back tub,

Mark the location of the bracket

Place the uteback into the tub to mark the location of the bracket, once marked remove the bracket from the Power Easy Uteback and fix inplace with the two Tek Screw’s. While the tub is in place check the length of the supply cable to ensure it reaches the Anderson Plug and Blue switch plug on the Power Easy.

Fit the Anderson plug to the cable and crimp on the supplied Genuine Anderson Plug. It is recomended to seal the tub wiring grommet at this point.

Remove the blanking cap from the floor of the rear tub to reveal the mounting hole for the front bolt.

Move the JTS Ute back into place, Fit your Deep Cycle battery and connect the positive and negative wires. Secure the side bracket and bolt the front of the box down.

Be sure to loop around the RS Strap before bolting the box into place. The RS Strap will secure your battery when fitted.

Now that the Ute Back Power Easy is installed it is time to connect up the Midi Fuse for the main power supply

Find a suitable location for the Midi Fuse Holder, On the Navara NP300 D23 there is space directly behind the battery. Measure back along your cable run, enough cable from engine bay the Fuse Holder. Mark this spot on the 8 B&S Twin sheath. From the front of the cable the battery split the sheath back to your marked point. Keep the earth cable asside for the moment.

Re-test your cable length and cut, fit the supplied cable lug. Measure the correct length of cable to comfortable reach the positive post of the battery, crimp lugs in place and fit the cable, Fit the midi fuse holder end first and the positive battery terminal second.

Once you are happy with the wiring in place, secure your midi fuse holder.

Meaure a comfortable length for the earth cable to reach the battery chassis earth. This is the earth point that directly connects the battery to the body. Using this point will help the smart alternator detect the load of the BCDC Charger.

Once all your wiring is in place fit the Midi Fuse to the holder and close the cover.

Now the fuse is connected you can plug in the Anderson Plug and quick connector on the blue wire.

Your dual battery system should now be fully operational. Start the vehicle and check the volt meter of your JTS Power Easy box or Ute Back to see the charger activate.

If you have any questions about the installation please call the team on 1300377128

The JTS Ute Back Range

The JTS Power Easy Range

The Original JTS Power Easy: Dual Battery Solution

JTS Power Easy Base Camp System


or 4 payments of $62.50 with Afterpay

The Original JTS Power Easy: Dual Battery Solution

Power Easy 25 MK11 – BCDC1225D


or 4 payments of $237.50 with Afterpay


or 4 payments of $37.50 with Afterpay


or 4 payments of $38.75 with Afterpay


or 4 payments from $37.50 with Afterpay


or 4 payments of $73.75 with Afterpay


or 4 payments of $387.50 with Afterpay

JTS Expedition Series

Power Easy Expedition


or 4 payments from $498.75 with Afterpay


Whilst every effort has been taken to ensure this document and its chapters reflect current best practices and Standards, Jamie’s Touring Solutions:

  • Provides this publication as a general guide only and recommends practices seek professional advice
    where required to suit specific vehicle needs and/or circumstances.
  • Will not be responsible for the results of any actions taken using the information in this publication, nor
    for any error in or omission from this publication.
  • Provides no warranty that adherence to this publication will satisfy the relevant criteria or guidelines
    issued by the vehicle manufacture
  • And the authors, consultants and editors of this publication hereby expressly disclaim all or any liability
    and responsibility to any person in respect of anything, and of the consequences of anything, done or
    omitted to be done by Jamie’s Touring Solutions or any such person in reliance, whether wholly or partially, upon
    the whole or any part of the contents of this publication.