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You don't really need a diagram, it's simple. If you open both tail light boxes in the trunk you will see at the connector on the bottom a yellow wire in the first position. That goes to the brake bulb. If both tail lights do not work, make sure you are getting power to the driver side light first, if it is not getting power, the passenger side will not work either, they are in line with each other. If it is only the passenger side not working, the bridging wire could be bad.. try jumping it. Also, make sure you are getting power inside the tail light bulb holder. The metal connections can come loose. If there is no power to the driver side tail light it could be the bulb failure relay, that is the round red relay in the rear left side of the fuse box behind the ash tray/ cigarette lighter below the radio in front of the shifter. You should be getting power to the third brake light in the rear window...that is a different circuit and will not be affected. Try changing out the bulb failure relay, it supplies the power to the tail lights.
I had the same exact issue to happen just last week as well. Passenger side front sidemarker/ and right rear tail both out, as well as my dashboard lights. Replaced fuses and bulbs but nothing. Stange thing is Signal light still works,,and its the same bulb. Any answers would be appreciated. 1989 MBZ 300e
replace the bulb, you can access the bulb when you open the hatch. there is a cover at the back of the tail lights. or go to your local autozone or pepboys. they will replace it for you with no extra charge
If the driver's side tail light is working, it's not a fuse. Use a test light to check for power at the bulb holder. One terminal will be for tail light, the other for brake/turn light. If the is constant power for tail light, replace bulb. If no power, trace wiring from bulb holder to driver's side junction. Probable broken wire between the two tail lights.
All th tail lights are the same type. However, the push-in socket that they attach to ,if there is not a real good connection, it gets too hot and melts the bulb base and the light socket. Remove the tail light assembly with a phillips driver. 1 screw and the assembly is removed by pulling it straight back while pressing the areas where there are molded plastic clips. pull the bulb straight out and examine the area where the wires are., Both the bulb and the socket. if they appear to be melted to the plastic, they need replaced, or can be temporary made to work by using a pair of needle-nose-pliers, or tweesers to position the wire in the proper place to make contact, untill a replacement is available. Note the bulb type when you remove it, and replace with the same type...OK The bulb isn't burned out, is it??...Look at the elements in the bulb. If one is broken, the little wire element will be separated inside the bulb. It needs to be replaced Thank you...OK
There is a contact in light wiring. At some point a wire to brake lights make contact to wire to front side light (peeled wire, bad insulated connector etc.) You need to have your wiring circuit inspected.
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