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Old 04-24-2006, 01:53 PM   #1
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Default LED turn signal Lamp monitor bypass circuit

Ive been working on putting a single LED in place of the 194 bulbs thats in my front turn signals. The problem are that the lamp monitor would be set off, the LED wouldnt work when the voltage reverses, and the LED needs a current limiting resistor. I hear that there are modules you can buy that do all this for you, but I built my own anyway.



It works with positve and negative 12v-15v, it doesnt set off the DIC, its directly plug and play just splice it in, and any LED that draws at least 80mA can be used. Ill get a pic of the led in the turn signal when i dont have to leave for work in 3 minutes :P
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Old 04-24-2006, 01:58 PM   #2
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I have the same wire strippers

I like it...NOW GET SOME INSTALLED PICS
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Old 04-25-2006, 12:41 AM   #3
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Phoenix, could you post a schematic of the circuit?
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Old 04-25-2006, 01:18 AM   #4
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Name:  schematic.jpg
Views: 2
Size:  8.0 KB

there ya go. the big rectangle on the left is a 40 ohm 5w resistor, the 4 in the center are diodes, and the top right one is a 180ohm 1/2 watt resistor. patent pending :P
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Old 04-25-2006, 03:27 AM   #5
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Very nice indeed- well done.
I might have to get some parts....
can't wait to see the the final install pics
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Old 04-25-2006, 11:45 AM   #6
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I hooked it up last night to see what it would look like, the good news, it works perfectly, the bad news, it doesnt make a night and day differance. Its just a single led in the standard light bulb socket. I was expecting more of a differance, but the colour is lighter, and it blinks faster. Now I need to change the front turn signals to led The pics dont show much but im at a laundromat right now so ill post some when i get home.
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Old 04-25-2006, 12:06 PM   #7
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Why the second resistor? Maybe that'* the light/speed issue??
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Old 04-25-2006, 12:09 PM   #8
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Quote:
Originally Posted by MOS95B
Why the second resistor? Maybe that'* the light/speed issue??
current limiting resistor
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Old 04-25-2006, 12:13 PM   #9
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Quote:
Originally Posted by sonoma_zr2
Quote:
Originally Posted by MOS95B
Why the second resistor? Maybe that'* the light/speed issue??
current limiting resistor
yup, it simulates a larger load on the wire to keep the lamp monitor from complaining that a bulb is out.
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Old 04-25-2006, 12:29 PM   #10
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Quote:
Originally Posted by corvettecrazy
Quote:
Originally Posted by sonoma_zr2
Quote:
Originally Posted by MOS95B
Why the second resistor? Maybe that'* the light/speed issue??
current limiting resistor
yup, it simulates a larger load on the wire to keep the lamp monitor from complaining that a bulb is out.
That'* right. You uppity folks with your lamp monitors.....

Well, now that you got the circuit worked out, all you gotta do is play with multiple LEDs, or different sizes. The hard part is over....
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