Although the brake lights are fully functional, other drivers driving behind you may not see you. The left front flashes rapidly and the right side signals work so I figure it's not the flasher unit. no tail light on both rear. As a result, an accident may occur due to dysfunctional tail lights. Stumped at the moment , been working late and haven't dug any deeper. 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 !!! Re: left turn signal and brake light not working on trailer It doesn't seem like it can be on the trailer. This made no difference. 2011 ford f150. Turn signals are good as well as the brake lights. The tail lights work but not the turn signal. Tail Lights not working. 32 3. robali123. 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. This shows that my left side light and wiring are OK. I' am having issues with my F150 1998 lights. Ground is achieved in one of two ways. In the first case, separate wires come out of each tail light assembly and are attached to a metal frame. So check the lights. 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 None of the marker lights work on the left side . When I swap the green and yellow wires at the connector, the problem moves to the other side of the trailer. Make sure that each of tail lights is properly grounded. A more common case scenario presupposes ground to be provided through the bolts of the tail light assembly. 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. I thought maybe a ground issue, but the other lights would work off the same ground I'd guess. One the left rear side of the vehicle the brake lights and turn signal does not work. Reasons Why This Can Happen 1. But the top 2 lights should come on when I turn on the driving lights and they don't. You can be cited by a traffic officer if your car tail lights are not illuminating or … 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. It is possible that one of the bulbs on your trailer burned out. F-150 1998 Issues with turn signal and brake light on left rear side 1 Answer. Trailer tail lights not working? The left rear brake light works. For a straightforward light or fuse replacement, you can fix your tail lights yourself for a fraction of the price. However, during the continuity check, it had just enough to show 0 Ohms. Before I start tearing apart the dash to trace wires to the fuse block, On one side of the fuse, it was giving a voltage reading of 12.5 which is correct. The left rear turn signal works. robali123. If your tail lights are broken or not illuminating, don't take your car to the mechanic! I don't know if you remember I put those nice LED bulbs in my tail lights just in the top ones not the turn signal and now my driver side rear tail lights are not working any suggestions I've had the bulbs in for almost a month and now nothing oh by the way the little tiny bulb 2 is not working in the tail light replaced bulbs (4057) but still not … I've replaced all the rear bulbs , haven't gotten around to the front marker bulb . 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