![]() ![]() On some of these vehicles, it's possible to put the bulb in backward this can cause a circuit failure in the lights and dashboard indicators.1967-71 Dodge, Plymouth Turn Signal Switch w/o Tilt 7 Wire Switch A, B, E-Body 1st Design Many vehicles now use turn signals integrated into the brake housings, using the brake lights themselves as turn signals. If the parking lights and hazards come on, but that side doesn't illuminate when you hit the switch, then it's a circuit problem as described in Section 3. This is also a good point to check your parking lights, which usually utilize the turn signal bulbs. Turn signals that don't work in one direction or the other may be due to a faulty switch, particularly if the non-working side starts functioning when you use engage the hazard lights. The more powerful bulbs are drawing more amperage, causing the flasher strip to heat up and cycle faster. Many well-intended persons have substituted a heavy-duty, high-wattage bulb or powerful aftermarket bulb, only to find the signals on that side flicker on and off rapidly. The bulbs determine how much power goes through the flasher, and thus how quickly it heats up. If only the signals on one side do it, it may be one of the bulbs. Most often, if all four turn signals are going too fast or too slow, it means the flasher is bad. If your turn signal flashes too fast or too slow, it's a problem with the heat rate transfer through the flasher strip. But, if one goes out, it's smart to replace all of them they all have similar lifespans. This doesn't always happen with a single bad bulb, though many vehicles use turn signals wired in parallel, so that if one goes out, it doesn't take another with it. Corrosion in one of the bulb sockets causing bad contacts is another possible cause. Alternately, the ground on either light could have gotten damaged or come loose. Check for damaged or burned-out bulbs in all turn signals on that side. If one goes bad, or it isn't properly grounded, it can affect the corresponding light on the same side. Turn signals on either side of the vehicle can be wired in series, much like the bulbs on a strand of Christmas tree lights. Bimetallic objects are often used in automotive applications, such as in bimetallic strips that are used to control car doors. The two metals are usually different colors, and they are bonded together. ![]() Bad grounds and connections are a possibility, but a bad fuse or flasher is more likely.Ī bimetallic object is one that is made of two different metals. If none of the lights come on, no matter what you do, it's a power supply problem. This might go back to a bad ground or bad connection somewhere in the system. Most likely, it's because the flasher is bad, but it could also be because the entire electrical system is weak, and can't provide the current necessary to heat it. If all four of your turn signals come on and stay on when you trigger either side or the hazards, the bimetallic strip in the flasher isn't arcing up and away from the electrical contact. These kinds of failures are fairly rare, considering - and they usually go back to one of two things. This cycle is what causes your lights to flash. When the strip cools, it drops back down again. This causes the strip to arc up and away from the electrical contact. Electrical current flowing through the strip heats it up, causing the metal on the bottom layer to expand more than the metal on the top. The flexible strip connects the electrical supply from the box to the wiring that goes to your turn signal switch. The flasher contains what's known as a "bi-metallic spring," which is a flat strip with one kind of metal on one side, and another kind on the other. Power for the turn signal system comes from your junction box, and flows through the fuse and then the flasher unit plugged into it. ![]()
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