can't find the bulb!

2000 C70...

Re: Directional...
Fast blink, passenger side...normal blink driver side..
Comparing passenger to driver, all bulbs seem to be blinking...

One in rear, side marker, one in front by headlight, and dash indicator...

Am I missing something??

 

Fast blink usually occurs when a bulb has failed, but might possibly
happen if one or more bulbs on the side in question have gone high
impedance (bad contact) and are taking less current than usual.

Switch on the hazard lights on a dark night, and see whether the two
sides flash with equal intensity. Or try cleaning the contacts on all of
the bulbs on the 'fast' side - and make sure that any earth wires make
proper contact with the bodywork (although a poor earth would also
affect other bulbs - tail/stop etc. - in the same cluster).

[As far as I'm aware, the bulb failure unit doesn't monitor the
operation of the direction indicators.]
--
Cheers,
Roger
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Thanks Roger, I'll check.. it's a good start!

 

[ ... ]

Don't some Volvos have fast-blink or bulb-failure indications when there
are mismatched bulbs, like when one has been replaced with a non-exact
replacement?

Might be worth checking to verify that the bulbs match.


Gary

 

The bulb failure sensor is a bit too sensitive and will turn on the
indicator with mismatched bulbs. The fast blink is separate, it's done
by the flasher itself. Old ones were electromechanical and blinked
faster with less load because there was less current to heat the bimetal
strip so the cycle was faster. Modern (as in the last 30 years or so)
flashers are electronic and may be excessively sensitive.

 

Thanks all, solved..
the front directional bulb contains 2 filaments.. the larger one, I guess,
is for directionals..once it fails, I guess the system resorts to the
smaller filament.. which is why I saw it 'blinking'... bulbed replaced, all
is happy!