The original 2-wire flasher units do not ground, they operate in series
with the lamps. The early 3-wire units don't ground either, the third
terminal is for the dash tell-tales. Only the later OEM 3-wire
electronic units have a ground wire. The apparent benefit of those
3-wire is that they don't slow down as system voltage falls and
connection resistances rise, which is why many fit them. However both
those problems are contributing to dim lamps, which is still the case
with the 3-pin flasher units, fix the faults instead.
But this is a mine-field, many people confuse them with hazard flashers
which are also 2-wire and 3-wire. Hazard flashers will appear to work
when used as a turn signal flasher but there is a delay after operating
the switch before the lamps light, which is ... a hazard, as is not
warning you when a corner bulb has failed, which both the original 2-pin
and the later electronic 3-pin do. LED flasher lamps fall into the same
category.
There are also modern cube-type 'universal' flasher units (they re not
'digital' any more than the others are) and most of those should be
avoided, some so-called LED flasher units need at least one filament
bulb to work.
PaulH.
On 15/04/2022 22:08, Max Heim wrote:
They are interchangeable either way, with a little effort. The 2-wire
ones ground through the housing â?? the 3-wire ones have a ground wire,
that can easily be added if not present.
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