Hi all ,
I have an odd turn signal problem My left rear signal does not work, the
front one does, I have replaced the bulb and also the light holder (small
circuit board), and still no go. I do get an indication that the light is
out by the fast past clicking on the turn indicator on my dash. 96 GMC
So my question is where does the turn indicator get its information? so i
have a bad wire somewhere? Any hints would be appreciated.
For example, if the flasher circuitry's input sees less current or more load
than normal it, in turns, causes the timer circuitry to blink faster. If I
remember correctly, two or more bulbs cause a normal blinks. One bulb causes
rapid blinks. You can bench-test your flasher timer with this rule.
Thanks for catching my error. Yes, "less current = less load" similar to
On an IC controlled flasher, lamp outage sensing is designed to sense whether
there is adequate current being demanded by the combined light bulb loads,
and, if not, the flasher will increase the flash frequency by a typical ratio
of 2:1. The method of sensing the above described "low load" condition
involves a current sensing circuit which monitors the voltage drop across a
very low ohmic value resistor.
There is also an internal reference voltage which is compared against the
voltage drop across the sense resistor, and the result of that comparison
determines if the oscillator will run at "normal" rate or at "double rate"
for bulb outage detection. Below are a few flashers:
Thermal (Thermo-Couple) shown here, as described by Dick:
Electronic (IC controlled) described above.
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