GW>
GW> JE> one). Two types of flashers now. Then for vehicles towing a
GW> JE> trailer with turn signal lights an even different flasher was
GW> JE> needed - one that would operate properly (flashes per sec) both
GW> JE> with and with out the trailer - commonly called a HEAVY DUTY
GW> JE> flasher here. My 89 Ford van used this method as did most vehicles
GW> JE> I came in contact with. I haven't looked at my 92 Ford Crown Vic
GW> JE> nor my 92 Chevy PU - which I use to tow a trailer. The PU came
GW> JE> with a towing package which may have included a flasher that takes
GW> JE> care of the trailer. The trailer has two bulbs in each the left
GW> JE> and right tail light.

GW>The towing package was probably no more than two relays to operate the
GW>lamps (one for each side) and a current sense relay in the feed to
GW>sense the trailer lamp current. These days this can be just a winding
GW>round a reed relay, the trailer lamp flasher inicator is driven by
GW>this relay. Probably set up to indicate "good" if a lamp
works, and if
GW>there are two it probably won't tell if one of the pair fails.

Since the trailer light feed is a tap off from the rear tail,stop and
turn signal light of the tow vehicle (in other words in parallel) how
would a relay get into this picture? I've wired many vehicles to supply
the trailer lights - there is no way the trailer lights can operate a
second relay. ONLY the increased current in the lamp circuits (tow
vehicle and trailer combined) causes the flasher to work. Sadly, I have
never taken a Heavy duty flasher apart to see how they work, simply
because I have never had one to fail and I wasn't about to take a good
one apart. :-)

Jay

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