I've noticed that in type 1157 or 3157 incandescent automotive lamps, there are two filaments with a common pin. The lamps are nominally 12 volts, but I wanted to use one as a load in a 24-volt application, and was wondering whether I could just use the two filaments in series. Or is that how they work?
I've been considering several possible scenarios for how the lights actually work in service, and can't seem to find the info on a quick google search. Possibilities:
1. One filament is energized for high beam, the other filament is energized for low beam.
2. One filament is energized for high beam, both filaments are energized in series for low beam.
3. One filament is energized for low beam, both filaments are energized in parallel for high beam.
4. Something else.
Anyone know?
p.s. sorry about the grammatical error in the title. I can't edit it.
I've been considering several possible scenarios for how the lights actually work in service, and can't seem to find the info on a quick google search. Possibilities:
1. One filament is energized for high beam, the other filament is energized for low beam.
2. One filament is energized for high beam, both filaments are energized in series for low beam.
3. One filament is energized for low beam, both filaments are energized in parallel for high beam.
4. Something else.
Anyone know?
p.s. sorry about the grammatical error in the title. I can't edit it.