Hi JAY,

On 31-Mar-04, JAY EMRIE wrote to GREG MAYMAN:


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

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

George

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