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I haven't carefully surveyed the turn signal behavior of all the
vehicles on the market, but in my experience I have noticed that a
single burned out bulb (i.e. a finite increase in circuit resistance)
can cause a turn signal flasher to flash a) significantly faster,
b) much slower, c) not at all, or d) with no noticeable change in
frequency depending on the particular vehicle and flasher in
question. Overall, with the cars I've had an association with, it
seems that case a) is a little more common than the other cases b),
c), & d), but that may be due to my limited sampling statistics.
If there was a short in the circuit I would expect that a fuse would
blow and that would open the circuit and shut off the flasher all
together.
My money is still on a burned out bulb on the left side. I hope Carl
will report back to us what he found out what the culprit is when he
finds out the cause of the problem.
David Bowman