Question about Toyota Corolla

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04 toyota corrolla I need to wire a harness for a utility trailer, not sure how many wires are needed and do I need 1 or 2 lights on each side of trailer. not sure on these newer cars with more than 4 wires. any help would be much, much appreciated as I cannot afford those fancy adapters where you just plug things together. THANK YOU IN ADVANCE !!!

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First and foremost, installing the wiring harness is not the easiest task, but not the most difficult. Typically you will use a 4 pole harness. One wire goes to tail light on, second wire goes to brake light, then one to left signal and right signal. You will need a test light of some sort in order to determine the hot or live wire for each bulb. Once you confirm the wire you can simply splice the wire off the harness into the factory harness. One thing I will mention at this point is using a typical four pin instead of a adapter that are a it more expensive can cause more draw on your cars electrical system. Although I have never had any problems on my cars. I have heard situations in which wires have become cooked.

As far as trailer lights go it may depend on the state. Here in IL, you can get away with running 1 light on each side of the trailer granted all functions work-brake, running lights and turn signals.

Good luck

Posted on May 26, 2011

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I dont know how to wire lights to trailer from 1986 toyota pickup


You need a "test light". Then you turn on the circuit you want to wire in, tail lights, brake lights, blinkers and poke around the back of your light sockets until the test light comes on. Then you splicew into that wire and run it to your plug in. If you don't know which wire is what on the trailer, hook it up and with the wire fastened into the truck harness, try it on the trailer harness wires until you get the proper lights working. Process of elimination. Hope this helps.

Nov 04, 2011 | 1985 Toyota Pickup

1 Answer

04 toyota corolla how to wire trailer lights without using one of those fancy adapters as i cannot afford it . Just a small utility trailer and will i need 1 or 2 lights per side THANX IN ADVANCE


Unfortunately you will need to buy some form of wiring converter. To work with your trailer lights. The problem is that your Corolla has a separate turn and stop signal, Trailer lights have one wire for turn and stop. I suggest the CURT 56175 3-2 converter. You should be able to find it around 20 dollars.

May 26, 2011 | 2004 Toyota Corolla

1 Answer

When i plug a trailer up to my 1994 toyota pickup, the trailer lights dont work. the lights over the license plate dont work. could there be a fuse that is blown, does the plate lights need to work for the...


You shouldn't need the license plate lights to work to make your trailer lights work. Chances are that there is an issue with the wiring it's self. On my father 94 pick up the wiring is spliced directly in the taillight wiring. If your taillights work there shouldn't be an issue with the trailer lights. Start by checking or remounting the ground wire attached to the wiring harness. If that isn't the issue test the input of the harness followed by the output. If there is input but no output you need to replace the harness. Try the CURT 55379 you can purchase this by visiting one of their retailers by clicking here.

May 07, 2011 | 1994 Toyota Pickup

1 Answer

Instructions for wiring a moving trailer connector


accessconnect_logo.jpg


Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4%20way%20wiring.jpg 4way_vehicle.jpg 4 way tow vehicle side.
4way_trailer.jpg 4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5way_vehicle.jpg 5 way tow vehicle side.
5way_trailer.jpg 5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6way_rectangle_1.jpg 6 way tow vehicle side.
6way_rectangle_2.jpg 6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.


6way_vehicle.jpg 6 way tow vehicle side.
6way_trailer.jpg 6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.


7way_vehicle.jpg 7 way RV flat blade tow vehicle side.
7way_trailer.jpg 7 way RV flat blade trailer side.

Jan 01, 2011 | 2001 Pontiac Montana

1 Answer

My o3 navigators adjustable brakes will only move about 1/2 inch either direction. It's fine if they don't work but is there any way to move them to the farthest position manually?


With both tail light lenses removed locate the black with yellow wires and the dark green with brown wires coming out of the brake/tail/turn signal sockets.

The black with yellow wire will be the running lights or tail lights and the brown wire from the trailer harness will attach to it.

The green wire on the trailer harness will be the right turn signal and will be attached to the passenger side tail light harness dark green with brown wire.

The yellow wire on the trailer harness will be the left turn signal and will be attatched to the dark green with brown wire on the drivers side tail light harness.

The white wire on the trailer harness is the ground wire and will need to be attached to a good ground. Is it pretty easy to crimp an eyelet onto the end of the wire and use a self tapping screw to attach it to the body behind one of the tail light lenses.

Here is a trailer light/wiring article I have done in the past. It has a couple of good tips you may find useful.

http://www.hotspotoutdoors.com/forum/ubbthreads.php/topics/1425999/1/Trailer_Wiring_101

Oct 27, 2010 | 2003 Lincoln Navigator

1 Answer

How to wire a 4 pin connector for a LED Tailgate bar into the brake lines on a 2000 dodge dakota without trailor plug


With both tail light lenses removed locate the black with yellow wires and the dark green with brown wires coming out of the brake/tail/turn signal sockets.

The black with yellow wire will be the running lights or tail lights and the brown wire from the trailer harness will attach to it.

The green wire on the trailer harness will be the right turn signal and will be attached to the passenger side tail light harness dark green with brown wire.

The yellow wire on the trailer harness will be the left turn signal and will be attached to the dark green with brown wire on the drivers side tail light harness.

The white wire on the trailer harness is the ground wire and will need to be attached to a good ground. Is it pretty easy to crimp an eyelet onto the end of the wire and use a self tapping screw to attach it to the body behind one of the tail light lenses.

Here is a trailer light/wiring article I have done in the past. It has a couple of good tips you may find useful.

http://www.hotspotoutdoors.com/forum/ubbthreads.php/topics/1425999/1/Trailer_Wiring_101

Oct 27, 2010 | 2001 Dodge Dakota

1 Answer

How to wire trailer lights to a toyota tacoma


The easiest way is to get the kit that plugs into the taillight harness to adapt your plug. If one isn't easily available then you can use scotch locks to splice into your trucks harness. Use a test light to make sure you locate the right wires in your trucks harness and go by the wire diagram on the instructions from the plug to hook it up.
I hope this helps!

Jul 22, 2010 | 2002 Toyota Tacoma

1 Answer

I installed a 4 wire trailer wiring harness on a utility trailer. Now when I try the left or right turn signal, both of the tail lights blink on the trailer. What could the problem be?


You have both signal lights interconnected. Disconnect it, and make sure that the two wires is allocated for each side. Then, connect the two wires to the right signal light of your truck. One for the ground, and the other wire for right signal lightbulb. Then, repeat the process for the left signal light. Use male and female connector, for easy disengagement
of your truck and the trailer.

Sep 22, 2009 | 2004 Ford F150

1 Answer

Towing light problem on wiring them up.


It looks like there could be a service bulletin to fix this.

TO: ALL TOYOTA DEALER PRINCIPALS,
SERVICE MANAGERS, PARTS MANAGERS
SUBJECT: SPECIAL SERVICE CAMPAIGN 10H
(2000 TUNDRA AND 1999 - 2000 TACOMA TRAILER TOWING WIRE HARNESS
CONVERTER REPLACEMENT)
Toyota will initiate a Special Service Campaign to replace the Toyota Trailer Towing Wire Harness
Converter (converter) on certain 2000 model year Tundra and 1999 - 2000 model year Tacoma
vehicles equipped with a genuine Toyota Trailer Towing Hitch or Bumper Hitch. This accessory
is included in the Towing Hitch Kit installed at ports (PIO) and by dealers (***); it is also sold by
dealers as an over-the-counter or service part.
An electrical short or open circuit can cause a fault in the genuine Toyota Trailer Towing Wire Harness
Converter (converter). This can cause a failure of the converter, and if a trailer is being towed at the time,
non-operation of the trailer lights. In limited cases, the converter housing could become heat-deformed.
In the case of the Tundra, the circuitry utilized in the converter was inadequate to properly manage
vehicle and/or trailer-side voltage spikes. If the converter is exposed to a voltage spike it may cause an
electrical short or open circuit within the converter.
As for the Tacoma, due to deficient waterproofing and improper installation location of the converter,
which is mounted in the lower portion of the taillight cavity of the vehicle, an electrical short circuit will
occur if water enters the converter housing.
The following vital information is provided to inform you and your staff of the campaign notification
schedule and your degree of involvement.
1. Owner Notification Letter Mailing Date
The owner notification will be conducted in two phases:
• The first phase will be launched in late August and involve vehicles equipped with port
installed (PIO) genuine Toyota Towing Hitch Kits.
• The remaining vehicle owners, whose vehicles may be equipped with a dealer installed (***)
genuine Toyota Trailer Towing Wire Harness Converter, will be notified in the second phase
to be launched in early September.
We have attached copies of the owner notification letters for your reference.
If you are contacted by an owner of an involved vehicle, who has not yet received a notification,
please verify eligibility through TDN or TIS, inspect the vehicle to assure it is equipped with the
affected part, and perform repairs as outlined in the attached Technical Instructions.

Jul 12, 2009 | 1999 Toyota Tacoma PreRunner

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