Front turn signal issue
 

Hi everyone. My 2004 grand marquis front left turn signal started blinking very slow and is very dim (can barely see it) with headlights off it blinks at correct speed but still very dim. All bulbs are working. What could this be. Car has only 46,000 miles and is in great shape. This has been driving me crazy for 2 months, any ideas?

Turn Signals
 

Sounds like you have some corrosion issues -- Remove bulbs and fuses, clean sockets, bulbs, and fuses and spray with WD-40.
That "dim" bulb should be replaced. It's "barely " working, and could be defective internally.
It's a good time to do the REAR bulbs and sockets, too.
Good luck !
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Sleeping Beauty, Rolling Thunder

I would also check all your ground wires