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Locate the switch that closes (turns on) when you open your trunk. Be sure you have power at the switch with a test light or meter. If you do, be sure the switch is moving and check with your test light at bulb socket for power. You need to trace the wire while checking for power along the way. The following may help if you're not familiar with electrical troubleshooting ...
First check the bulbs as they fail most often. once the bulbs are tested and or replaced and they still don't work. check the park fuse in the fuse box under the dash. when you change it watch it as it might blow right when you plug it in. Some radio installers se the same wire in the radio and get it connected wrong and so unplug any aftermarket radio. and then see if it holds a fuse. You didn't state if the running lights including the tail lights are not working? If the parking lights and dash lights are working and you still have no taillights. The light fixtures them selves as you take them out to change bulbs may have a bad connection. With the lights on and the mounting fixture hanging by he wire. move the bulb and the wirs around it pushing and pulling to see if you can find the bad connection. the light sockets do go bad and they can be purchased at most auto parts stores. Lets say they still don't work. under the trim in the trunk, near the trunks latch in the bottom part remove this trim and thiers the light out module. this module does many things so its expensive. It's suppose to trun a warning light on the dsah that thiers a light not working. Sometimes if the bulb has been out a long time or the wire crodded in the sockets or even at the plug for the module. with only the parking lights on and a test light. go into the wire side. of the plug still plugged into the module. with the key off and removed. their should be three wires that light the test light. One is the wire from the lightswitch fuse the other two are the two taillights. if only one wire lights the light you found the problem if the taillights still don't come on. Find the wires that do light the lights and conect them to the wire that comes on when you turn the lights on and it's fixed just without the bulb out feature working.
It could be a ground problem. See if you can trace the ground wire from the bulb socket. If you can identify which connector of the bulb socket is the ground, you can do a continuity test from the socket to the frame or body, using a multi meter. You can also use the multi meter to check for voltage at the socket; positive lead of meter to positive connector of socket and negative lead of meter (black) to a ground. If you get voltage ( about 12 V ) then the problem is a broken ground wire.
-Are you talking about the dome light and door lights...?
-Make sure the dimmer switch is turn to ON position and high . Then open 1 door and check the wire go to the light with Ohm meter. You should have 12 volts. If not then check the fuse.
You will need to check wiring at the sockets, turn lights on and remove the tail lights from tail lens and wiggle bulb to see if they will light up . this is to see if its a connection in the socket.
Another area to check is to open the hood and check the wiring going to rear lights, look toward the driver side trunk hinge and check for broken wire or wires. this is a common area for wire damage. look closely.
Check the wiring going to the chassis holding the brake light bulbs. In the trunk when setting groceries and other items inside someone may have knocked a wire loose.
When you say none of the brake lights did you mean turn signals and parking lights as well on thefront and back?
Do you own a DMM - digital multi-meter ? Do you know what a wiring diagram is an how to read one ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model an engine size. Under system click on lighting, then under subsystem click on courtesy lamps. Click the search button then the blue link . First diagram , look at the right , you will see trunk room lamp .At the top you'll see the fuse the supply's power to the lamp . Check for B+ voltage going in an out , check the switch . Electric Testing Techniques You Need to Know
Usually all you have to do is pull back the inside trunk liner behind the tail lights from inside the trunk, or there may be a plastic door that you open to access the tail lights. The wires going to the tail lights connect to a plug that you turn counter clockwise and pull out from the back of the tail light assembly. Once you have removed the connector replace the bulb. Some light bulbs just pull straight out of the connector, others you may have to push in and turn counter clockwise to remove.
my tail lights on a 2002 buick regal do not go on when lights are on, I changed a couple of the bulbs still nothing, brakes lights and backup lights work.... also the inside dash lights do not work could it be a related problem,