Why won't my drivers side blinker work with head lights on?


Asked by Nov 24, 2014 at 06:34 PM about the 1999 Ford F-150

Question type: Maintenance & Repair

Recently I have noticed that my
driver's side blinker (front and rear)
will not work when my head lights
are on. The bulbs light up, but will
not flash. When my head lights are
off, both front and rear blinkers work
as they should. I checked both bulbs
and filaments appear to be intact. I
replaced the rear bulb anyway, as it
appeared to have a burn mark on it,
and still nothing. I also looked at the
sockets, and they appear to be in
good shape. Could it be the flasher?
Or would a bad flasher cause both
blinkers to not work? Not sure what
else I could check.

2 Answers


probably is your flasher.i think you have two one for your flashers and one for your turn signals


Also just discovered that the break lights do not work with the lights on, but work with the lights off. Could this be a ground issue? If so, where would I begin?

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