 Alternator Light Can you Use an LED, Replacing the alternator light with an LED bulb |
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| LotusJoe |
 Oct 29 2013, 02:13 PM
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#1
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Europa Twink Driver  Group: Members Posts: 406 Joined: 30-November 09 From: Southern California Member No.: 11,085 Region Association: Southern California  |
Can you replace the alternator bulb in the dash with an LED? Will the circuit still operate correctly? (IMG:style_emoticons/default/confused24.gif)
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| stugray |
Oct 29 2013, 05:04 PM
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#2
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE When wired in parallel does the resistor act like an incandescent bulb? yes, as a matter of fact you can just use the bulb if you want. QUOTE A 70 Ohm resistor is about the equivalent of a 2 watt bulb. I started with the bulb wattage to come up with 70 Ohms. Pwr = 2.5W = Volts*Current = V^2/R using V = ~13.5 yields: R = 72.9 Ohms So the alt is expecting about .185 Amps. I had some 140 Ohm, 1 watt resistors. I just put two in parallel and put that across the LED. |
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| LotusJoe |
Oct 29 2013, 05:32 PM
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#3
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Europa Twink Driver Group: Members Posts: 406 Joined: 30-November 09 From: Southern California Member No.: 11,085 Region Association: Southern California |
QUOTE(stugray @ Oct 29 2013, 04:04 PM)  QUOTE When wired in parallel does the resistor act like an incandescent bulb? yes, as a matter of fact you can just use the bulb if you want. QUOTE A 70 Ohm resistor is about the equivalent of a 2 watt bulb. I started with the bulb wattage to come up with 70 Ohms. Pwr = 2.5W = Volts*Current = V^2/R using V = ~13.5 yields: R = 72.9 Ohms So the alt is expecting about .185 Amps. I had some 140 Ohm, 1 watt resistors. I just put two in parallel and put that across the LED. Thanks so much for your help. That's what I'll do. (IMG:style_emoticons/default/smilie_pokal.gif) |
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Posts in this topic
LotusJoe Alternator Light Can you Use an LED Oct 29 2013, 02:13 PM
timothy_nd28 No, the LED will cause your car to stop charging. Oct 29 2013, 02:17 PM
LotusJoe
No, the LED will cause your car to stop charging.... Oct 29 2013, 02:53 PM timothy_nd28 Yes you could add a resistor to simulate the same ... Oct 29 2013, 03:01 PM LotusJoe
Yes you could add a resistor to simulate the same... Oct 29 2013, 03:25 PM Mikey914 I just use a reg bulb for the charging circut. Als... Oct 29 2013, 03:05 PM Mikey914 Correct me if I'm wrong, but as I understand t... Oct 29 2013, 03:07 PM nathansnathan The problem, as I understand it, is that the indic... Oct 29 2013, 03:10 PM timothy_nd28 quick and easy fix "I think", keep the L... Oct 29 2013, 03:33 PM LotusJoe
quick and easy fix "I think", keep the ... Oct 29 2013, 03:44 PM stugray
Actually that is close. The LED only flows a few... Oct 29 2013, 04:02 PM LotusJoe
Actually that is close. The LED only flows a fe... Oct 29 2013, 04:11 PM |
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