I have a 2003 Hyundai tiberon SE. Recently the

If you have a bad light bulb it will make the blinker light flash. Check all turn signal light bulbs.

check your fuse panel...

brake lights and blinkers use the sale filament in the bulb
the running light is the other (in a dual filament bulb)
you may have a poor connection or a break inside the bulb base.
test with a known good bulb.
the next place to look is the connector on the light switch and the joint where the running lights split off.

I would change out the dim bulb. usually blinkers blink when you have a bulb out either in the back or front blinker.if both are good then I would replace the flasher.

it is still bolted to the a/c condensor in front of it. it may only have two 10mm bolts then slip out of some slots at bottom of radiator.

Low beams are easiest to reach. Open the hood, find the locking cap behind the light housing and turn it a half turn to remove. Unplug the bulb. Disengage the spring lock holding the bulb in place and remove the bulb (be sure you don't touch the glass).

The bulb base has three small flanges that seat right into corresponding slots in the bulb housing. Seat the new bulb using these flanges, lock the bulb into place with the spring lock and replace the locking cap.

The high beams are harder to get to. You might need to pull the battery on the driver's side. The windshield washer tank on the passenger side might also give you some problems. Once you have room to maneuver, the procedure for changing the bulbs is exactly the same as for the low beams (they even use the same bulbs: H7).

Insufficient Information

There were two different engines which were installed in the 2003 Tiberon... the 2.0 liter 4 cylinder:


And the 2.7 Liter V6:

Make sure bulb replaced is the required 2 way or 1 way. If you're sure you put in the right bulb type (1 way or 2 way) 6 or 12 volt.. bulb model marked on side for replacement (Check carefully). Assuming its the right bulb type and still blinks fast, you will have to replace the socket. Sockets do get corroded and worn. Disconnect the battery, cut positive then cut negative. Wire up new socket same way using wire connectors. Tape up connections after.
Should then work.
Make sure before you do this you have the right bulbs in all sockets (front and rear) and that all lights work 1st. One failing light front rear same side can cause this problem.
Go to a scapper to get a socket.. just cut it off a wreck... take a couple of them. There cheap.
Good luck

I HAVE DECIDED NOT TO CHANGE IT.

BEST REGARDS,

H.M. STINE