Trying to wire a rear view camera to 2010 cadilac dts. Which wires on the tail light goes to the back up lights? It's all sealed.

If your 2010 Crown Victoria has functioning headlights, brake lights, and turn signals but no tail lights, the issue could be with the tail light circuit or with a specific component in the tail light assembly.
Here are a few things you can try to troubleshoot the issue:

• Check the tail light fuses. Make sure that the tail light fuses are not blown. Check the vehicle's owner manual for the location of the fuses.
• Check the tail light bulbs. Make sure that the tail light bulbs are working properly, if not replace them.
• Check the wiring. Make sure that the wiring for the tail lights is connected properly and that there are no frayed wires or broken connections.
• Check the brake light switch. The brake light switch is responsible for turning on the brake lights when the brake pedal is depressed. Make sure the brake light switch is working properly.
• Check the turn signal switch. Make sure the turn signal switch is working properly, and properly wired to the tail lights.

If the problem persist after trying the above solutions, It would be best to consult a professional mechanic or an auto electrical technician to diagnose the issue, as it could be a malfunction in one of the electronic module that control the lighting. It's a good idea to take the vehicle to a dealership or repair shop that specializes in Ford vehicles. They will have access to the wiring diagrams and repair information needed to correctly diagnose and repair the issue with the tail lights.

Why do you need to change a bulb's normal function when there is already a Brake light bulb fitted. What is the problem you are having?
You would have to rewire the actual light fitting assembly itself but these tend to be prebuilt sealed units with a mass produced wiring board.
If your having issues with a faulty brake light check the fuses, bulbs and wiring connectors on the back of the light fitting. It is usually a lot easier to simply replace a faulty light fitting.

You can usually remove one of the tail lights and run the wire through the tail light wiring harness grommet.

you are missing a ground wire
what is happening is when you have the tail light on it is grounding out through the brake light so that when the brake is applied the current is stopping that taillight working by pushing current back through the bulb
the same principle that puts out the charge light when the alternator starts working

Hello Scott, I would say you have connected to the brake light wire. I connected my back up camera to the tail light wire. I turn on my headlights to view the back up camera.

1) Open trunk
2) Remove small round plastic access panel with a flat tip screw driver by prying open
3) Remove flat tip screw holding tail light assembly
4) Remove tail light assembly by pulling outward, careful not to break plastic guide/nub
5) Disconnect wiring connectors
6) Remove plastic housing access plate on back of tail light assembly by twisting/turning tabs until they click and then lift access plate from tail light assembly
7) When viewing the the bulbs, the turn signal bulb is the bottom left bulb
8) Install in reverse order, ensuring tail light seal seats properly during installation

no parking lights @ rear tails, yes ! do you have a wire diagram, get one, there in the back of the haynes repair manuel. could be a bad connection @ rear, a wire may be shorted, corroded, after all, these wires are subject to road salt, debris, etc., inspect them closely, turn your parking lights on, pull on the wire harness, wiggle it, see if lights come on. have a helper watch for you when you do this. do your brake lights work? make sure your tails are in good shape, these light components corrode inside, so inspect them closely, then, follow the wire harness from rear to front along frame rail, to check condition of wires, all of them, if in good condition, check under dash, where you replaced switch, check fuses, use your wire diagram to locate and under stand the color of wires that come from the rear, and there function, remember, we are dealing with the tails, what powers them, and which ones do what. ignor all other wires, keep it simple dude. have a trouble light with you, It looks like an ice pick, with a wire lead on it and a aligator clip on it to attach to a good ground. electrical problems have a bad ground, remember that. by now you should know your wires for the tails, usually there green. with your taillights on, and your trouble light hooked up, check each wire to see if the troublelight goes on, this wire is good, if troublelight does not light up, wire has no continuity, therefore its bad. patience is a virtue, remember that. test wires on a circuit you know works, so you can feel more positive about what your doing, these problems can be easy, they can be @#$!%& , remeber, your trying to power up your tails, keep it simple, one wire @ a time. good luck,

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Re-seat the connector at the back of the bulb/ unit. if you shake the harness and light flickers then the contact,or wireing has a short and can easily be fixed with a new connector or splicing the bad wire.

With the car off. Put the park brake on and put it in reverse. When the light comes on take a test light and see witch wire has power.