Why does the car turn signal flash quickly?
2 Answers
Reasons for excessively fast turn signal flashing: Burned-out turn signal; Poor contact in the turn signal; Inconsistent power or model of the turn signal bulb; Faulty bulb control relay, etc. Below is relevant information about turn signals: 1. Introduction: The turn signal is an important indicator light that activates when a motor vehicle turns, alerting surrounding vehicles and pedestrians. The turn signal tube uses a xenon tube, controlled by a single-chip circuit, with alternating left-right strobe operation. Turn signals employ flashers to achieve light blinking, mainly categorized into resistance-wire type, capacitor type, and electronic type. 2. Structural Principle: The resistance-wire type can be further divided into thermal-wire type (electrothermal) and vane type (spring-action), while the electronic type includes hybrid (relay with contacts and electronic components) and fully electronic (no relay). For example, the spring-action flasher utilizes the thermal effect of current, using expansion and contraction as the driving force to create sudden movement in the spring plate, thereby connecting and disconnecting contacts to achieve light blinking.
When I notice the turn signal blinking unusually fast, it's usually due to a burnt-out bulb or poor contact. Think about it—each turn signal on a car is controlled by a dedicated control unit and relay. Once the filament in the bulb breaks or the connector becomes loose, the circuit's resistance decreases, causing the current to flow faster and the blinking frequency to spike suddenly. I've encountered many such cases—like short circuits from damp wiring on rainy days, blown fuses, or worn-out relays—all of which can cause this issue. Quickly check the bulb's condition: unscrew the lens to see if it’s blackened or not lighting up. If replacing the bulb doesn’t fix it, you’ll need to inspect the relay or fuse box. This might seem like a minor issue, but it can mislead other drivers into thinking you’re changing lanes, which is especially dangerous on highways. Don’t delay—getting it fixed at a repair shop is the safest bet.
