This happens at a rate of one to two times per second. The remedy is to add an additional resistor to each turn circuit, or to find a flasher unit intended for LED bulbs, (or to add an additional incandescent bulb somewhere - not the best way to go). The turn signals use a flasher unit that acts as a repetitive circuit breaker. If you have substituted LED bulbs for your turn signals, they draw significantly less current which will result in the condition you described. The usual cause of this symptom is a burnt out or incorrect bulb on the side that is malfunctioning. If the turn signal has been left on too long it does a second tone similar to the one you get when you exit the car and leave your lights on. With almost no current passing through the resistor, the spring steel quickly cools, bending back away from the contact and breaking the circuit. The turn signals flash too slow in one or both directions. Check outgoing voltage from the turn signal switch to the faulty turn signal side of the circuit. I’ve noticed something on my 2015 Cherokee. This forces the curved spring steel into the contact so that current flows to the signal lights unimpeded by the resistor. At this point, the current is so small that the lights won't even glow dimly.Īfter less than a second, the small piece of spring steel heats up enough that it expands and straightens out the larger, curved piece of spring steel. Current flows through the resistive wire, heating up the smaller piece of spring steel and then continuing on to the turn-signal lights. Initially, the spring steel does not touch the contact, so the only thing that draws power is the resistor. This completes the circuit, allowing current to flow. When you push the turn-signal stalk down, the thermal flasher connects to the turn-signal bulbs by way of the turn-signal switch.