Light bulb question about an 1157

[alph]

On an 1157 light bulb, there are two filaments, which one is for the running lights, and which one is for the turn signal/break lights??  I’m making an LED light set up and I want to make all white LED’s for the running lights, and Amber LED’s for the turn signal lights.  I’ll post a video when I get this all done!! 

[Jess from VA]

Pull the lens off your taillight and watch which filament is run and which is brake.

[X Ring]

Even then you still have to figure out which contact sends power to each filament.  Easier to figure out which wire is supplying the feed you want then attach it to the appropriate led set.

Marty

[Rio Wil]

Just a thought, is it legal to have  a white light visible from the rear as a running light?

[tank_post142]

red only

[Daniel Meyer]

The fat filament is the brake/turn light. Thin is the running light.

[alph]

The fat filament is the brake/turn light. Thin is the running light.

thanks Dan, i'm at work so it's hard to take the lens cover off the cycle from here!!  as for having a white light, it's for the front turn signals, not the rear.  i have a clear lens cover with an amber bulb in it right now for turn signals and running lights. what i am making is an array of white LED's as the running lights, and amber LED's as the turn signals in front.  the amber LED's will flash with the signal voltage, and the white will stay on all the time (cause they'll be wired into the running light circuit).  it'll make sense when you see it, it will look as though i've got "fog" lights that will also have an amber flash for the turn signal, all in the same housing, the exsisting turn signal housing.  

al.

red only

you can have amber as rear turn signals.  

[RonW]

You can either unplug the P-connector and take a continuity reading....the stripe-wire would be the running lights (low-filament).




Or, with the ignition ON, and the lens removed....take continuity reading by grounding one of the voltmeter's leads to the metal socket-plate. You can see in the very bottom pic that the ground wire is soldered to the back of the metal socket plate. The signal shown is not a Valk signal but the internals are Honda generic.




The low-filament will be either the top-contact or the bottom-contact, at 6 o'clock or at 12 o'clock. However, this configuration might not be consistent from socket to socket depending on how the stripe-wire and solid-wire are plugged into at the back side of the contact disc. Different work shifts at the factory, so to speak.




This is off-topic, but if you get carried away and decide to wire in electrical inputs to the rear signals, LED's or incandescent, the same input will feed to the front signal's HI-FILAMENT since the rear 1156 high-filament and front 1157 high-filament are hard wired together. Both of the front signal's filaments....hi-filament and low-filament....will light up as shown in the pic below.