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Trailer Wiring Harness Installation - 2010 Mazda CX-9

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Mazda CX-9 Wiring

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Installation of a Trailer Wiring Harness on a 2010 Mazda CX-9

Today on this 2010 Mazda CX9 were going to install part number 118520 from Tow-Ready. The first thing need to do is open up the back hatch. What we need to do is get access behind the tail light so that means have to remove all the floor coverings. It looks like Ive got to take the subwoofer now and move it out of the way so we can move this panel out. Well unsnap our electrical connector and we get back to the threshold and remove it. Theres a tie down loop here and here we have to remove.

Additionally were going to take off these two tie down points as well go get a little bit easier room to see whats going on inside. Were looking at the drivers side, and the same thing would apply the passengers side. Now we can start pulling away the panel from the inside. This is a connection point for a wire harness theres a latch we have to push in and then we can pull it apart. Were running out T1 connector underneath the plastic and up to the connector and putting it between two halves.

Ill take one half for our connector, plug it together, take our other half and plug it back into the other side. Next well go ahead and mount our ground, and heres a nice factory body bolt right here. Well use it for that purpose. Well go ahead and take our module, and were going to use adhesive to stick it to the sheet metal back here. Well go ahead and wrap our four-point wire harness over the jack storage compartment.

Well take our wire and zip it to the factory harness. Lets go ahead and zip tie these together. Well go over to the passengers side of the vehicle and repeat the same process for the connector. The T connector wire harness is a little on the short side, so were just going to remove the connector from the wall and just plug it in that way to give us some extra slack. All right, now well go ahead and start working our wire to be ramped to the battery for power.

The black wire will connect to the red wire with the black stripe from the module. To get up from up to the battery well remove this grommet right here. Well drill it out and then we can run our wire through that. Just kind of clamp it in a vice. Well just go ahead and drill right through it. It should be just thick enough for our wire. Lets go ahead and take our wire. Well just push it through the whole for now, pull most of it through, slip our grommet into place and push it back into the sheet metal. Well connect the two wires together, use the supplied butt connector. Pull our access wire out of the bottom and well run a little bit of silicone around it as well. Were going to go ahead and run a wire up to the front of the vehicle to the battery. We must take care and make sure we dont hit anything thats moving like suspension components or anything hot like exhaust. Well go ahead and pull the wire up from the engine compartment and then well go ahead and run it over to our positive terminal. Well cut our wire short and then add our fuse holder. Take our fuse holder, cut it in half. One side will add the ring terminal and the other side will add a butt connector and hook it up to the black wire. Were just going to attach this to our terminal right here. Well use a 6 mm nut with a 1.0 thread pitch to tighten it down. Now well go ahead and install our fuse into the fuse holder. With our wiring fully installed well go ahead test it with test light first, and then we can try it with the trailer. Then we can go ahead and reinstall all the interior components. Well go ahead and show you how to use the harness. Now remember its stored inside the jack storage compartment. Just go ahead and open it up. Just pull it out and put the lead back together. Just pull out the wire harness down to your trailer hitch and then go ahead and shut the door on it. Just make sure you stay away from the latch so you dont cut the wire. With that, that will finish our install of part number 119520 from Tow- Ready.

Info for this part was:

Video Edited:
Zack K

Video Edited:
Joshua S

Test Fit:
Rick A

Video by:
Patrick B

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Mazda CX-9 Custom Fit Vehicle Wiring Videos

Trailer Wiring Harness Installation - 2012 Mazda CX-9

Today, on our 2012 Mazda CX-9, we'll be installing the T-One Connector withUpgraded Circuit Protected ModuLite from Tow Ready, part number 118520.Now, we'll begin the installation by opening the rear door and folding the rear seatsforward. We'll now go ahead and remove the interior panels. We'll remove the trunkfloor panel, as well as the threshold. Now, we'll set those aside for reinstallation later.Now, on both sides of the vehicle, we'll need to remove the cargo loops. We'll do thisso that we can pull the trim panels away, to gain access to the plugs in the factorywiring harness. Now, here on the drivers side, we'll need to disconnect the factoryharness here at this plug.

Trailer Wiring Harness Installation - 2012 Mazda CX-9

Today on our 2012, Mazda CX9, well be installing Tow Ready T-1 connector module light kit, part number 118520. Now, to begin our install well simply open the rear cargo door. Well need to remove the lower panel here. Well need to undo the two bolts holding in the cargo tie-downs. With our tray removed, we can go ahead and remove our rear threshold. Now, that our interiors disassembled, well peel the side panel away to expose our taillight connector.

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