Why headlights flashing ?

Too many acids man ....

Flickering or flashing? There is a difference.

Flashing happens when a cars alarm gets set off, along with the horn honking

Flickering is not a constant synchronized flash of light, it's an inconsistent flashing that can be dim, bright or either.

That's usually from a bad alternator. you have AC ripple. Try running another ground wire to the alternator housing first before replacing the alternator.

If it s someone behind you they want by, let them pass you. If it s coming toward you, be sure you are going the speed limit. Usually means that enforcement is close by. If it s coming from above you.....well, you can figure that on your own. If it s your car then it could be a myriad of electrical problems ..... from, loose or broken connections, dirty connections, faulty alternator....or regulator, bad switches..........

Please identify your vehicle.

p.s. Thanks.

If the headlights rhythmically "pulse" (normal-bright cycling) it's a voltage regulator problem.

If the headlights randomly flicker (on-off cycling), you have a circuit problem. Wiring, socket, relay, high-low switch, ground connection.

Do the running lights flicker too?

Does it flicker when you hit a bump on the road?

Does it happen on high beams too?

Do you have DRL (Daytime Running Lights)? This is a Canadian requirement. The high beams are on at reduced brilliance.

Have you added "other" lighting, like trailer, etc?

Flashing, or flickering? Yeah, it makes a difference.

Flashing is set by a relay. Flickering is from loose connections.

False contact. I ..

If its a vehicle coming towards you from the opposite way , it simply means that police have set up radar on the road ahead and the driver is giving you a chance to avoid a ticket

DRL module possibly or the relay that turns on the Daylight Running Lamps and the headlight relay control system. Ask your local dealer for a wiring diagram or take it to someone who can diagnose the problem. Flashing intermittently could also indicate a bad headlamp circuit breaker or possible short in the headlight wiring harness. Too many cars these days to know them all without a AllData schematic and and cavity harness color code pin-out header printout.

If the high beams do it to, with the engine off, then its a ground problem