Owners of other Acura or Honda vehicles such as the RDX, ILX, TLX, RLX, TL, CL, RSX, RL, TSX, ZDX, NSX, Integra, Pilot, Accord, Civic, Fit, Clarity, CR-V, CR-Z, HR-V, Odyssey, Element  and Ridgeline may also find these DIY instructions to be helpful.

To complete this procedure, you'll need an Add-A-Circuit fuse holder and a USB 12V-5V Adapter (optional).

The tools required include a digital multimeter, a fuse puller tool, some new mini blade fuses and a socket set.

Locate the electrical panel situated closest to the intended installation location for your automotive accessory.

In my 2006 MDX, there is a fuse block located just below the driver side of the dashboard near the emergency / parking brake foot lever.

I plan on attaching a Besign BK01 Bluetooth audio adapter for my Blitzsafe AUX input adapter to the side of the steering wheel column.

(If you'd like an AUX input for the Bose stereo in your MDX, check out my Blitzsafe AUX Input Installation Guide.)

I also have an A/C vent mount for my Samsung Galaxy S5 Android smartphone on the far left driver's air vent.

Decided if you want a circuit that is always on / hot / active such as for an alarm system, or a circuit that is only when the ignition is "On" such as for a dash camera.

I decided to use the 10 amp number five fuse socket which is for the DRL lights (on Canadian models) and the rear window wiper. This circuit is only "hot" when the ignition switch is turned to the "On" position.

Avoid installing an Add-A-Circuit fuse holder to any electrical socket for an "essential" electrical feature such as the airbags, brake lights, ABS (anti-lock braking), turn signals, fuel pump or even the windshield wipers.

I chose the # 5 fuse socket since it would not be a big deal for me to lose the ability to use the rear window wiper if the Add-A-Circuit adapter malfunctions or blows the fuse while I am driving.

You would not want something like the headlights, reverse lights or the horn to stop working while driving since that could impair your ability to drive safely during certain conditions.

Turn the key until the ignition switch is in the "On" position.

Set your multimeter to measure DC volts.

Touch the black ('-" negative) probe to a metal part of the car, such as the bolt end next to the fuse panel.

Then touch the red ("+" positive) probe to one side of the socket. 

If the multimeter LCD display reads 0.00 volts, that is the load / ground side of the socket.

If the multimeter indicates about 12 volts, that is the hot / active side of the socket.

The rear / left side of the socket (closest to the rear of the SUV) was the hot 12V side.

Loosen the nut on the bolt end on the left side of the electrical panel by turning it counterclockwise with a 10mm socket, an extension bar and a 1/4" drive ratchet.

This is where I will attach my black ground wire.

So for my application, I pushed the red 10A rear wiper fuse into the socket closest to the metal electrical contact blades.

The brown 5A fuse was included with my Add-A-Circuit adapter and should be plenty for my dual USB 12V-5V adapter which is supposed to only draw no more than 3 amps.

Take a look at my simple diagram in the picture above.

I used a small felt marker pen to label the 12V hot side of the Add-A-Circuit adapter.

The 12V hot metal blade is the one on the left and the load / ground is the metal blade on the right (closest to the red wire).

I slipped the USB cable for my Besign BK01 Bluetooth audio / hands-free telephone adapter and the USB power cord for my cell phone down between the steering column and the gauges on the dashboard.

Strip some of the insulation away from the black ground wire.

You may choose to use a spade terminal ("U" shaped) connector to attach the ground wire to your vehicle.

I just wrapped the bare wire around the bolt end.

Tighten the 10mm nut to secure the ground wire in place.

Insert the red wire from your USB adapter into the connector on the Add-A-Circuit. Crimp the connection to secure the two red wires together.

Make sure that the hot 12V blade is inserted into the hot 12v side of the fuse socket.

Carefully push the Add-A-Circuit into the socket until is fully seated.

Turn the ignition switch to the "On" position.

Test the accessory to make sure it works properly.

I plugged my Bluetooth adapter into the 3.5mm headphone jack on the Blitzsafe AUX input, turned on the Bose radio and pressed the XM / AUX button until the display read "CDC".

I was able to play music from my phone via the Bluetooth adapter while also charging it with the micro USB wire.

Then turn off the ignition switch.

To complete the installation, you'll need to neatly route all of the wires and possibly secure them with small cable (zip) ties.

Rotate the knob in the center of the cover 1/4 turn counterclockwise to unlock the fastener.

Gently pull out the cover.

Replace the cover under the dashboard and secure it by rotating the fastener 1/4 turn clockwise.

Be sure to record the Add-A-Circuit installation in your SUV's service records just in case the next owner has any issues with that fuse panel or the electrical component that is sharing the circuit.

For more, please check out all of my 2001-2006 Acura MDX DIY Repair & Maintenance Guides.