Trailer Wiring Harness Installation - 2001 Mercury Grand Marquis

Installation of a Trailer Wiring Harness on a 2001 Mercury Grand Marquis

Today on our 2001 Mercury Grand Marquis we'll be installing the Tow Ready Wiring Kit, part number 119176KIT. To begin our install we'll need to remove the rear threshold in the trunk. After removing the threshold we'll need to pull off the clip holding the carpet in behind our tail light.With the clip removed we'll simply peel the carpet down exposing our wiring here on the driver's side. We can use the test light included with our hardware kit to locate the signals we need for the harness. We'll simply back probe the connector to locate our signal.We can undo the tape exposing the wires a little farther back on the harness. Now we've determined that the brown wire on our factory harness is our tail light signal, the green wire is the left turn signal, and the orange with blue tracer is our right turn signal.

Now in making our connections, our brown lead on our ModuLite will go to the brown lead on our factory harness. The green wire on our ModuLite will go to our orange wire with blue tracer on our factory harness. The yellow wire on our ModuLite will go to the green wire on our factory harness. Our red wire which is our brake signal for our ModuLite will be put to ground. Now that we've identified where our wires all go, we'll use our Quick Connect, also supplied with our install kit, to make our connections.

We'll simply slide the factory wire into the Quick Connect, we can then feed the ModuLite wire into the Quick Connect and using a pair of pliers we'll clamp down the metal tab. This will pierce the wires and make our connection. We can then close the plastic cover and move on to our next wire. With all the wires tapped, we can then wrap electrical tape around it to further secure it in place. Now you remember from before that our red wire on our ModuLite will need to go to ground.

To do this we'll strip the insulation from the wire and add an eyelet. We'll use a ground that is already predetermined by the manufacturer as seen here. Next we'll need to run our battery feed wire to our ModuLite. We'll need to locate a body plug underneath the carpet here in our trunk. We can then use a utility knife, cut a small slit in it, and pass our black wire through.

We'll then bring the wire up to our yellow and black connector on the red wire, and after stripping the insulation from our black wire, we'll make our connection to our ModuLite. With our connection made, we'll need to find a suitable location for the ModuLite box out of the way and safe. The ModuLite box comes with a piece of two-sided tape already attached to it. So we can simply remove the adhesive protection and adhere it to the body of the vehicle. With that out of the way, we'll extend our 4-pole connector and reinstall our carpet. With our carpet back in place we can then reinstall the plastic threshold. Now we'll move underneath the vehicle. We need to run our battery lead from the trunk up to the front of the vehicle where our battery is. You'll need to make sure that when grounding your black wire you keep it out of the way from any moving components such as your suspension or any hot components such as your exhaust. Now that we've got our black wire fed up to the battery we can install our fuse link. We'll cut the wire for the fuse link in half, attach a butt connector to one side and our ring eyelet to the other. We can then strip the insulation off the black wire and attach our butt connector to the other side. With our fuse link installed we can then attach the ring eyelet to our battery positive terminal. Now if your eyelet is too big, you can cut a chunk of it out to shrink the ring down. After making our connection to the positive battery terminal we'll install our fuse into the fuse link which will energize our ModuLite. And that will do it for our install of part number 119176KIT the Tow Ready ModuLite on our 2001 Mercury Grand Marquis.