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If you've replaced your turn signal relay and checked to be sure all of your turn signal bulbs are working but still find that you have no working turn signals, you'll have to get down to some semi-serious electrical troubleshooting. Prepare yourself, because this can get a little frustrating. Tracking down a loose wire or a ground that isn't grounding can be a pain in the neck. But let's get to it.

Turn signals are one of the easiest systems in your car to troubleshoot — your signal flashers either work or they don't. If your turn signals are not working, they'll be doing one of these things: blinking rapidly, coming on without blinking, or nothing at all.

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This step may seem silly, but since turn signal systems can be very tricky, and I've seen all sorts of unexplained fixes for them, It's a good idea to inspect all fuses when replacing a turn signal or addressing other unexplained electrical problems. A bad circuit that may seem to have nothing to do with the turn signals or brake lights can somehow cause them to fail.

In order to replace your bulbs, you had to access the back of the turn signal housings. Also in this location, you'll find the plugs that connect your tail lights and front turn signals to the car's electrical system. Unplug these and plug them back in one at a time. Sometimes just the act of unplugging and replugging can renew the connection and solve your issue. Don't be surprised if one of the plugs that you didn't think was affecting the turn signal system turns out to be the cause of your problem. Turn signals are tricky like that.

Some of the most extraordinary things come in small packages. Inventor Shuji Nakamura, along with two other scientists (Isamu Akasaki and Hiroshi Amano), proved that theory to be true when they developed the blue light-emitting diode in 1992. This innovation allowed for further advancements such as the white LED light, which revolutionized technology in various ways. Lighting is now more efficient, energy costs are lower and light pollution has been reduced. LEDs have improved existing products like flat screen TVs, headlights, street lights and more. Not only that, but white LEDs, can be charged using solar power, which enables those in regions without electricity to light their homes. In 2014, these advances were recognized when Shuji Nakamura and his fellow scientists won the Nobel Prize for physics.

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In his third year, Nakamura attended a lecture on semiconductors, an experience that persuaded him to stay at the university and obtain a master’s under Professor Osamu Tada. Spending hours in Professor Tada’s lab, nicknamed the “Junk Room,” Nakamura played with old televisions and other electrical devices. Tada later introduced Nakamura to Nobuo Ogawa, the founder and president of Nichia, a chemical engineering firm. It wasn’t until several failed attempts that Nakamura was given the funding to begin his blue light-emitting diode research. The majority of the financing went towards specialty equipment and general upkeep of his lab. Even with steady ridicule from younger researchers who doubted his contributions to Nichia, Nakamura continued working twelve hour days. Victory finally came in the early ‘90s when Nakamura put all the remaining pieces together, and the blue light-emitting diode was born.

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If your turn signal doesn't light up at all or doesn't flash, it can often be a bad ground connection that's the culprit. In most vehicles, the ground wires will be either brown or black. In any case, you'll want to trace what you suspect to be the ground wire from the bulb housing to its termination point, which is the point at which it screws or bolts to the vehicle's chassis. When you find this, loosen and retighten the ground connection. You can even remove it and clean everything off with steel wool if you want to be sure.

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Shuji Nakamura, a man once seen as an under-dog in his field, brought new meaning to the way we live our lives. The technology he helped create continues to grow, and consistent strides are being made to build even better, more sustainable light sources. Shuji Nakamura has shown us that our dreams not only change how we see the world, but also can change how others experience it. Nakamura founded Soraa, a company dedicated to producing affordable, energy-efficient light bulbs all while molding the minds of the future engineers of the world at the University of California, Santa Barbara.

Some vehicles have separate flasher relays for turn signals and hazard lights. Be sure to check both systems while you're thinking about signal relays. Hazard lights can be very important.

Shuji Nakamura was born May 22nd, 1954 in Ikata, Ehime, Japan. Nakamura’s father worked as a maintenance man for Shikoku Electric Power and taught Shuji how to build toys, an innocent skill that would later benefit his professional career. As a boy, Nakamura had little love for academics, his passion throughout his school years was volleyball. He later dreamed of becoming a physicist or mathematician, but his poor entrance exam results denied him access to prestigious schools. In 1973, he began studying electrical engineering at Tokushima University.

If the signal blinks really fast, you have a bulb out on that side. If it doesn't come on at all or doesn't blink, you'll need to replace your turn signal relay. Your turn signal relay is as easy to replace as a headlight, and they are almost never expensive.

If you've determined that you need to replace your turn signal relay, you're in luck—it's easy! In fact, it's one of the easiest repairs you'll ever do.