Headlamp bulbs - -96 LHS

Back in the days when all cars had a headlight relay, did you EVER see
anybody who got stuck in the dark by that failure? I didn't. The US car
makers made pretty good choices on that particular set of issues.

Now, I don't mean Lucas.

 

Good point.

It's understood that you have at least one relay for highs, one for
lows. You couldn't have indpendent control of hi/lo beam with one
relay. When I say one or two relays, I mean one or two for each (hi
beam or for low beam).

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

Well I am not Daniel Stern but I will take a shot at it anyway. A system as
you describe it would require a blocking diode to be installed between the
relay contact connected to the lamp wiring and the existing wiring from the
switch/ relay coil otherwise as soon as the relay pulled in it would
override the switch and self energize causing it to never turn off.

 

Hah! Right you are. It's called a latching relay circuit. And to
think - just last week I designed a circuit that was *intentionally*
designed to do just that (latch after initialization).

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')