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Re: Wiring a 2005 Taurus sedan for a trailer hitch.
If you can't get a wiring diagram... locate the wiring harness for the lights.... use a multimeter to test the wires....even one of those ice pick type of testers with the light on it will do
have someone step on the brake.... whichever wire has voltage is the brakes. next have them turn on the right turn signal... check for voltage on the other wires... it will of course be off on . do the other side the same way. all you have left is the wire for your running lights.... turn on the parking lights for that. also if i remember right there is a connector already there for the towing package. even if you didn't order that with the vehicle it's likely there. check in the side panel where you store the jack.
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If you adding a trailer light harness, you can buy a seperate harness from most auto parts stores that will plug right in. There should be a connector near the rear of the truck that you can unplug, and add the trailer harness. It's simple and fast and you don't end up making a mess of your wiring. I suggest puting some "dielectric grease" on the connections to prevent corrosion.
Flat 4 connector.
Brown is tail lights and marker lights.
Yellow and Green are turn and stop. I think yellow is left.
White is ground.
I had an odd type of fixture on my trailer too. I went to Tractor Supply and bought an adapter. I would imagine the brand of trailer you have should make adapter "PIGS" for what they sell. An RV parts outlet should carry something for you too.
Another place which may be able to help you is "U-Haul". They used to install trailer hitches and put permanent wiring into vehicles for an additional fee when renting their stuff.
No the wiring system changed to a 2-wire system. You actually wouldn't need a specific harness. You could purchase a 4-flat connecter (at least 60" long) and directly splice it in behind your tail lights. The 4-flat will have 4 colors
Green- Right turn/Stop
The Equinox wiring colors are quite similar. I will list the 4-flat color first-and then the Equinox color.
Driver side behind the taillight.
You can buy an adapter that will go in between your rear lights & main harness under van at connector, that will allow you to hook it up correctly. If it's a small trailer & no brakes on it, you may get a way with a flat 4 connection, provided your signals & brakes light use same bulb, otherwise you will need a small inline converter wired in also. Get back if you need more clarification. If only flat 4 and no brakes req'd, you can splice in to wires inside rear hatch that go to tailights. You decide & let me know if you need help. P.S. All you need is a test light (12v) and some connectors.
I had the sam problem with my '02 escape when I installed the hitch. I changed the turn signal relay under the dashboard on the drivers side of the dash with one from an escape that had a tow package(one was blue and the other was yellow...). worked fine for me after that. Don't know if it changed later...