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Old 07-15-2013, 11:38 AM
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Calling Electrical gurus please

Hey guys i want to solder ~60 leds on a 6x10 board and put it in my taillights and have every other column off until i hit the brakes when they come on thus making them brighter. Problem i am having is since the voltage that the truck make varies i cant have resistors that allow the leds to operate within the safe operating range so how can i limit/control the voltage going into the lights so that theres no fluctuation? Capacitor?
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Old 07-20-2013, 09:03 PM
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Okay, you want to make the board where every other row is on with the park function and they all light up when you hit the brakes?

PARK LIGHTS: (on) (off) (on) (off) (on) (off)

BRAKE LIGHTS: (on) (on) (on) (on) (on) (on)

Like that?

The voltage the truck makes, should not vary, it should be a fairly consistant voltage to the park light circuit and the brake light circuit. I have never checked the voltage of the park light vs brake light side at the bulb as I assumed it was 12VDC at all times, with the varying brightness due to the dual filament bulb in a brake light on these trucks. If you could, take a volt meter and tell me what the voltage is from park light positive to ground and brake light positive to ground. That info will help me with the next step...

Sorry it took me so long to reply, been tied up spending time with my daughter.
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Old 07-21-2013, 01:50 AM
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That's not too hard. Figure your truck will be around 14v running. Setup two parallel/series circuits and either diode isolate them or use relays. Ie. with 2v LED's, set them up in strings of 7 in series then parallel the strings together. Connect 1 string to the brake light circuit and the other to the parking light circuit. Use a diode that's rated for the current of the led's to connect the two circuits together. Also, remember LED's are diodes, they must be wired in the correct direction or they won't work.
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Old 07-21-2013, 08:17 AM
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Here you go i made this thread to better explain my situation
Wiring LEDs please help
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