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ajohn505 05-26-2007 02:19 PM

ZX3 Trailer Lights Wiring Tips
Ford Focus ZX3 trailer wiring information is hard to come by for some reason. People here are quick to say "buy the Haynes manual, look at the wiring diagram" which is certainly good advice, but not what you're looking for on an online forum.

Here's how I wired my 2005 Ford Focus ZX3 for trailer lights using a 72" 4-wire hardwire kit from

1. Remove the carpet covering the spare tire.
2. Loosen the left side interior molding on the trunk area. There are 4 metal screws (and 1 plastic screw + fastener near the seatbelt area). Note that I left the side towards the front of the car still attached.
3. Remove the plastic molding along the bottom rear of the trunk. There are 4 plastic screws + fasteners.
4. Remove the fastener holding down the left side carpet that's located near the rear.
6. Pull back the carpeting and interior molding, exposing the wiring. You will see 2 push-in connectors. One of the connectors will have a Y connection about 3 inches away from it - one of the bundles will travel along the bottom of the rear of the trunk to the right side taillight and the other bundle will head up the rear of the car to the left taillight

After the Y splits off, you splice the wires as follows:

Use a razor to carefully cut into the black electrical tape around the bundle of wires. Be careful not to damage the wires themselves

7. Using the tap splices that came with your hardwire kit, connect the Left turn signal lead to the predominately light blue wire leading to the left taillight. Connect the Taillight lead to the predominately orange wire leading to the left taillight. Connect the Ground lead to the black wire leading to the left taillight. For the Turn signal, be careful that you're tapping into the light blue wire going to the tail light and not the one going to the trunk light. When you're looking at everything back there it will make sense.
8. Using a tap splice, connect the Right turn signal lead to the predominately light blue wire leading to the right taillight. You can splice it right after the Y splits off towards the right taillight and not have to remove any molding or anything on the right side.

Be sure you completely (but gently) press the tap splice closed with pliers. The metal part of the tap should be flush with the plastic housing.

That's it. I ran the wires under the carpeting in the spare tire area and plan to just leave it hanging out the back of the hatch when I tow my motorcycle. Just put all the carpeting and molding back in place and you're all set.

I don't get it - There is a push-in connector on the Left side of the car - why doesn't someone make a T-connector for it?

The Curt trailer from went on perfect as well, the drilling of the frame on the right side being the only annoying part. Be sure to torque everything down to 75 lbs. with a torque wrench. It's a lot of torque, and not an amount you can put on with a short-handled wrench.

auto 05-26-2007 02:36 PM

Great post! I don't tow with my car but I know some here do and this will probably come in handy!

You should snap some pics of the process to go along with each step......
But either way great post!

ajohn505 05-26-2007 03:09 PM

I was thinking about pics, but I had to get everything done before the rain started... either way I figured that someone that's going to tackle a trailer hitch install and trailer wiring would find this to be enough info.

I'm not going to tear it apart now for pics :)

ajohn505 05-27-2007 12:01 AM

I forgot to note -

Be sure that when you loosen the side molding on the left side that you reach around behind the trunk light and remove the light from its holder - just turn the whole bulb assembly (don't touch the bulb itself) counterclockwise and it will slide rearwards.

paul-WI 06-26-2007 10:10 AM

I joined this forum to find this specific information. It was very helpful. I have an 07 3 door and installed a Kurt hitch. That was a piece of cake. I needed the color codes for taillight/turn signals and found them here. The only thing I did different was I tapped in before the wires seperate to each tail light. I used a pick at the plug to determine which wire goes where. Here is what I found:

Orange - tail lights
blue/red - right turn
blue - left turn
black - ground

Yours may be different, but I doubt it. Just use a pick at the connector.

Thanks for the info

carcrash 08-04-2007 03:08 PM

I can confirm the wiring colors are the same for the 2004 Focus Sedan LE. I also tapped in before the wires separated, it is much easier and cleaner IMHO.

One more addition to paul-WI's instructions though:

Green with black stripe - brakes

(it is the wire that is spliced into two already, one wire to each side)

mwalsh 02-27-2009 05:09 PM

Anyone know if the wiring for the '03 will be the same?

Got my hitch installed already and am just waiting for a Euro 50mm ball (no a 2" ball won't work!) before I get stuck into the lighting connections.

iminhell 02-27-2009 08:05 PM

I'd probe the connector to double check.

... and how is it you need a euro spec ball for a US spec car/trailer? That shouldn't be.

mwalsh 02-28-2009 10:24 AM


Originally Posted by iminhell (Post 2609636)
... and how is it you need a euro spec ball for a US spec car/trailer? That shouldn't be.

Ah, but my trailer coupling is Euro spec too, you see.

mwalsh 03-06-2009 03:33 PM

Well, I got my Euro ball in the mail this morning. Still haven't done the wiring for light yet, but those parts I can pick up pretty easily:

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