So i managed to get the right hand lights working this morning, the earth was the problem, grinding a new one has made them work great however now the engine wont start and the left hand light cluster only has reverse light on. 1 volt across the opposite side of the fuse, it was not letting enough voltage through the rest of the circuit to activate the lights !!! The left rear brake light works. 32 3. robali123. A more common case scenario presupposes ground to be provided through the bolts of the tail light assembly. Turn signals are good as well as the brake lights. This shows that my left side light and wiring are OK. The left rear turn signal works. If the bulbs are not the problem, disconnect the trailer's wiring system from the tow vehicle. Reasons Why This Can Happen 1. Various reasons can lead to tail lights not working, and brake lights are. Before I start tearing apart the dash to trace wires to the fuse block, Stumped at the moment , been working late and haven't dug any deeper. Trailer tail lights not working? When I swap the green and yellow wires at the connector, the problem moves to the other side of the trailer. I've replaced all the rear bulbs , haven't gotten around to the front marker bulb . My left rear turn signals stopped working recently so I did the easy thing first and replaced the bulbs. Test all of the lights, from the backup lights to the turn signals and brake lights to ensure the problem is not the tow vehicle itself. Re: left turn signal and brake light not working on trailer It doesn't seem like it can be on the trailer. So check the lights. You can be cited by a traffic officer if your car tail lights are not illuminating or … The left rear backup light works. For a straightforward light or fuse replacement, you can fix your tail lights yourself for a fraction of the price. The tail lights work but not the turn signal. 2011 ford f150. no brake light on driver side rear, no indicator on driver side rear but it works at top middle and passenger side rear. It is possible that one of the bulbs on your trailer burned out. However, during the continuity check, it had just enough to show 0 Ohms. F-150 1998 Issues with turn signal and brake light on left rear side 1 Answer. One the left rear side of the vehicle the brake lights and turn signal does not work. replaced bulbs (4057) but still not … Ground is achieved in one of two ways. The left front flashes rapidly and the right side signals work so I figure it's not the flasher unit. In the first case, separate wires come out of each tail light assembly and are attached to a metal frame. Tail Lights not working. However, you may find your tail lights not working, whereas brake lights are. Left tail light does not work changed lamp still did not work Unplugged socket with bulbs in it and tried on the right side and it worked Checked voltage with connector back on left side 12 volts on the outside light that works and .06 volts on inside lights that don’t work Make sure that each of tail lights is properly grounded. robali123. So, in summary, all 3 left rear light bulbs work individually but the top two bulbs do not come on when I turn on the driving lights. But the top 2 lights should come on when I turn on the driving lights and they don't. If your tail lights are broken or not illuminating, don't take your car to the mechanic! None of the marker lights work on the left side . On one side of the fuse, it was giving a voltage reading of 12.5 which is correct. 32 3. As a result, an accident may occur due to dysfunctional tail lights. no tail light on both rear. This made no difference. 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