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It's probably the voltage regulator inside the alternator. Sometimes, your headlights pulsate from your vehicle drawing too much power from the stereo electronics. This is often the case with a vehicle carrying heavy amounts of amplifiers and heavy-hitting bass.
Another idea would be to check the voltage regulator or the alternator. The alternator is what creates the vehicle's power (like a generator) and the regulator simply regulates the power that is sent from the generator. If the either of these are having troubles, this could be causing the flickering lights. I would first check to see if the belts that turn the alternator are loose. If they are fairly loose, then your belts are causing a pulsating power to be created. Think of it like peddling a bike only half of the time. It would cause a speed-up and a slowing down. In turn, if the belts are pretty tight, it's likely your problems are being caused from the regulator not regulating an even flow of 12 volt electricity to the car. The headlights merely flicker because they power flickers from going up to 100% and down to say 80% and so on.
What else can I help you with?
What would cause lights to flicker or pulsate on 98 Tahoe and yukons?
bad or failing alternator
What would cause your brake lights to not come on with the headlights on If the headlights are off the brake lights are fine?
Possible ground issue at the taillights.
How do you turn on the switch for 2001 Toyota Celica fog lights?
its on the left turn signal switch, at the end is the headlights, then one in is the fog lights, you twist it just like you would the headlights
Why would the gauge lights and radio lights go out when the automatic headlights come on in a 2000 Buick Regal LS?
the dash and radio lights are supposed to dim when the headlights come on. Make sure you have the brightness of the dash lights turned up as much as possible.
Why would the headlights of a 1988 Honda LXI be weak on dim and the bright lights only work on the right side?
A bad ground wire will cause dim headlights, or will cause lights not to work.
What would cause the headlights tail lights interior lights to stop working on a 86 caprice?
probably the fuse is blown.
What would cause the headlights radio and dome lights to quit when headlights are turned on in a 1996 crown vic?
I would replace the headlight switch as Ford has had their share of these problems.
Why would just the headlights not come on when you turn on the lights?
A broken wire, a dead battery.
Why would the bright lights not work on a 2000 Mazda B2500?
Switch? both headlights?
Why would the dashboard lights go out when you turn on the headlights on Vauxhall Astra?
Because it is British.
Why would the brake lights on a 1998 318ti work normally without the headlights but stay on constantly with the headlights?
if you recenly replaced bulbs u may have installed them backwards they should be running lights and brake lights if this is the case they maybe installed incorrectly
Why would the headlights on your 2002 Chevy Avalanche go out when you turn on the bright lights?
Perhaps the high beam part of the lights are rs
