Location third brake light wires

That sounds like a very non-standard installation so impossible to say! Perhaps aftermarket alarm, remote starter, tow bar package, or fancy lights.

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As far as the size goes I have n0o idea, but if you would like to do this install correctly and have the car start after install (it is hooked into the security system) contact www.crutchfield.com

From the GM 2005 Chevrolet Equinox Service Manual:

Remove Spoiler:
1. Open the liftgate
2. Remove the liftgate upper interior trim panel to expose the center bolt
3. Remove the spoiler to liftgate bolts (3)
4. Disconnect the stop lamp harness
5. Disconnect the rear washer hose
6. Lift the spoiler to disengage the locating retainers and remove the spoiler from the liftgate

Remove the high mounted stop lamp assembly:
1. Remove the spoiler to high mounted stop lamp screws
2. Disconnect the electrical connector
3. Disconnect the washer hose
4. Remove the stop lamp from the spoiler

Install the high mounted stop lamp assembly:
1. Position the stop lamp assembly to the spoiler
2. Connect the washer hose
3. Connect the electrical connector
4. Install the spoiler to high mounted stop lamp screws, tighten to 2 N-m (18 lb in)

Install Spoiler:
1. Position spoiler loosely over the liftgate
2. Connect the rear washer hose
3. Connect the stop lamp harness
4.Push down the spoiler to the liftgate to secure the locking tab retainers
5. Install the spoiler to liftgate bolts; tighten to 2 N-m (18 lb in)
6. Install the liftgate upper interior trim panel
7. Close liftgate

Run a ground wire from the light to the body. This should solve your problem.

The power wire that you are looking for is green with white tracer and the ground wire is Black.

Use a test light to confirm it powers with the brake before you hook it up

all of the brake lights are on the same fuse. If the other brake lights are working than the fuse is good.

If I remember correctly this third brake light is located in the trunk lid. I would suspect that there is a broken power or ground wire going to the socket for the bulb. The usually area for this to happen is where the wiring harness flexes when the trunk is opened and closed. I think the connector for the harness is in the same area and I'm pretty sure it is on the drivers side. Take a peak at the wiring in that area. you may have to remove some tape to get a good look. If there are wires broken than a simple repair should get it working again.

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There can be a faulty connection or break of the wire that goes to the light. This can be in the boot hinges harness as it can get damaged in this section.
If the tail brake lamps are workingg then the fault is only in this section as it is normally coupled to the tail brake circuit .So remove the lights and trace the wire down the harness to find the open wire.

if the third brake light works then ther is a broken wire. start looking for it at the tail lights and work forward if you cant find the break you can always run a new possitive wire from either the third brake light to the tail lights or if the trailer wiring harness hase power to the brake lights you can splice in there as well. hope this helps

the 3rd brake light is mounted to the spoiler. you need to remove the spoiler from the liftgate to acces the mounting bolts and the wire clip. there are five points of attachment of the spoiler,four hex nuts (metric) and one snap clip. two are accessable when the liftgate is open, they are in the corners of the liftgate. two more are under the upper rear window interior trim. the interior trim is held on by snap clips. if you pry outward on the trim starting on the right side of the window and work your way toward the middle you will be able to gain access to the two other nuts. once you have removed all four nuts, then close the liftgate and remove the spoiler by lifting up to disengage the last attachment point (snap clip). you will then need to change the light by removing the two nuts and disconnecting the wire clip. re-instal is the opposite of above. make sure that the wire for the third brake light does not get pinched when installed. (mine was improperly installed from the factory and the wire was pinched and this may have been why there was an early failure of the light)

The best way to wire a third brake light is to run the wire directly from the brake light switch on the side of the steering colum to the light. You will need a test light to find out what wire lights up when you push the brake pedal. Then you can splice into it when you run your wire to the rear light.