Step 1: Parts
the speakers easily fit in the tool box with about an inch of space on each side. Having the speaker boxes with slanted sides helps to aim the music away from the truck.
flat and phillips screwdrivers
wiring diagram for radio
Step 2: Radio
Method 2 would be to wire them parallel with the other speakers and add a toggle switch to turn the rear speakers on and off. This method may work best for factory stereos, or if the radio head unit does not have wiring for rear speakers.
The radio used in this example has wiring for front and back speakers and a remote control that makes it easy to switch between songs from outside.
Taking the radio out of the car varies, but usually they have a face plate that can be pulled off (picture 2), a frame that is snapped in (picture 3), then the radio can be pulled out (picture 4). I used a flat screwdriver to pull out the radio. Check the radio installation instructions before doing this step so that you don't break the radio.
To take the face plate off, there should be an eject button. If there is no eject button, the face may be attached. The black frame should be pulled off without any tools, but if it is stuck, you can use a flat screwdriver to pry it off.
Wire the radio in step 5 after the wire is ran through the truck.
Step 3: Running the Wire
First, find where the holes are by looking from under the truck. Remove the plastic trim on the floor to free the mats (picture 3). Then lift up the floor mats to run the wire to the holes.
Push out the plug in the floor and run the wire through it. Then run the wire under the truck and between the cab and bed to the tool box.
I ran the wires for both the left and right speaker through the same hole.
Check that the wire is long enough to reach the speakers from the radio before cutting the wire.
Step 4: Wiring the Speakers
To attach the speakers to the top of the tool box, I used baling wire, but they can be glued or screwed in. The baling wire is about the same color as the speakers and is nondestructive. I used speaker wire in the photos so it is easy to see the wire.
Start by finding 3 points that the wire can be secured to. My toolbox has a pipe running along the lid that was easy to feed the wire through, then I wrapped it around the locking clasp and where the piston attaches to the lid. It took some tweaking, but the speaker can be secured. The fourth picture shows the final speaker placement.
Step 5: Radio Wiring
Using the radio diagram, wire the speakers to the radio. Match the left tool box speaker to the left radio output and right speaker to right radio output. Be sure to use the same positive wire that you used in for the speaker. Cover the wire with electrical tape or a wire nut so that the wires are not showing.
Test the radio and speakers before putting the radio back. If everything works, proceed to step 6. If you have problems, check the radio wiring diagram, then check all the connections.
Step 6: Finishing Up
Reverse the steps used to pull the radio out to put it back in. Put the plug back in the hole. Lay the floor padding back down on top of the speaker wire, and screw the trim back on.
Under the car, make sure that the speaker wire is not hanging low. I used a small piece of baling wire to secure it in place.
Take the truck out and test out the speakers.