The headlight housing is a high power consumption devices. Combined with the inherent visibility of the headlight, this attribute will often make a car’s traffic lights, the first components to suffer from electrical system failures. These failures can vary from bad terrain; to an alternator, there is no simple worn cable. The problem is that it is worth analyzing since the flashing lights can indicate a serious failure in the electrical system.
For example, if the 9004 led headlight bulb barely seem to blink at random intervals – particularly when driving on bad roads – then the problem is almost certainly a loose connector or bulb. Loose connectors can go from the wiring harness in the switch. Loose fuses and headlight bulbs are also a possibility.
The current that flows through the headlight wiring put under a lot of stress. The constant high current flow voltages combined with heat in the engine compartment, unwanted bends, and bending and abrasion on nearby objects can easily cause a wire either to break internally or to ground in the frame. This condition is the only other that can cause random blinking.
Constant and regular flickering on and off can be the result of a bad headlight relay or headlight switch. The relays are electromagnetic switches: When one fails, it can open and constantly closed as the current consumption through its rises and falls. Internal switch failures can do the same, but they are a little less likely to be a bad relay.
Energy is known to cause the beating of the headlight housing – some people even of this type since the low beam car headlights will dim in response to the low blow. However, serious failures in the other components can also cause excess current consumption. Many of the components that are on the verge of failure build up heat and resistance, then turn off as internal resistance exceeds the input power. Engine cooling fans are known for this disease. Still, a bad fuel pump, clutch air conditioner compressor, electric block, and cabin heaters, and even windshield wiper motors, can cause intermittent current consumption.
Alternators generally fail gradually, but that will not always be the case. Most alternators use an integrated voltage regulator to maintain production at a constant speed of 14.2 volts or less. In the absence of a voltage regulator, the alternator diodes can rapidly peak and voltage drop, whatever a regular or random blink, depending on what broke.