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PostPosted: Mon May 06, 2024 5:16 pm 
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Location: Central Illinois
Year and Trim: 1992 SSE
2009 G8 GT
I tried switchback LEDs, both random Amazon brand and Diode Dynamics, and they are always yellow. Never white like they should be when on as parking lights. I am talking about the turn signal bulbs in the headlights by the grill. They are 2057 bulbs.

I've done some multimetering and some stand-alone voltage regulating.

On as parking lights:
Pin A has 10v
Pin B has 12.5+ (running system voltage)

When turn signal is on:
Pin A cycles between 12.5+ and 2 volts
Pin B has 12.5+

With the voltage regulator and the LED in hand, the only way to get the white light is when only pin B has voltage. If both pins have voltage, it is yellow. Even when they both have just 10 volts. Seems like I need to get down below 7 volts before nothing lights up.

So to make the LED switchback like it should, I would have to block the voltage above 7 volts to pin A while the parking or headlights are on, but allow voltage to pin A when the turn signal is on.

How would I accomplish that?

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PostPosted: Mon May 06, 2024 9:09 pm 
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What would happen if you used Ohm's Law and add resistors to get the resistance and current back to what circuit B would be as a 2057 Bulb?

I'm assuming the measured voltages were with the LED installed.

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PostPosted: Mon May 06, 2024 11:10 pm 
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Location: Central Illinois
Year and Trim: 1992 SSE
2009 G8 GT
I think the parking lamp power and turn signal power comes from different paths. I think if I snip the parking lamp power circuit (pin A), the LED will work as intended. I think that will also set off the bulb monitor. I think I can fix that by putting in a resistor to ground on the snipped circuit. I think maybe putting a resistor inline with that circuit instead could also work. I think I need to look at my FSM.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights


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PostPosted: Thu May 23, 2024 11:04 am 
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I've just quickly cycled the power switch for the light I have them on. I have switch backs in the fogs on the Caddy. A quick cycling of the fog light switch, switches them.

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