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how to keep 3 volt instead of going up to 6 volt Answered

hi, i have a honda camino , i want to make a rear light. first how do i get the 3.0 volt staying on 3 volt ac and what do i have to do if i use four bright white led in parallel,i have to have 5 watt in total.

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LasVegas (author)2007-09-22

Could you be more specific as to what you intend to do? I'm sure we could give you more specific information. I'm assuming you want to replace your backup lamps with LEDs? What you want/need to do is adjust the current to the LEDs appropriately to drive them with the available 6v (DC). This would require the use of one or more resistors depending on how many LEDs you're using and how they're connected. You do not need nor want to use the full 5 watts available. Using less power is the whole idea of replacing the old incandescent lamps with LEDs.

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CameronSS (author)LasVegas2007-09-22

Is there an Instructable somewhere, or a website that shows how to properly connect resistors? You (and others) often state that an LED is incorrectly wired, but I haven't seen an explanation of how to properly wire one.

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Here is a link describing how to calculate the series resistor.

Cheers,

Pat. Pending

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lemonie (author)2007-09-24

The thing should have a 6V battery(?). Could you add a 3V rechargable pack, and run a charge circuit off the bike's electrics? Some kind of regulator would probably be in order... I know the unregulated supply from a Honda Caren will give up to 20V and blow 12V halogen spots... we've never really fixed that feature. L

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alex4421 (author)lemonie2007-09-24

no th ehonda camino doesnt has a battery some have , but not many

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alex4421 (author)2007-09-23

i m going to bet for my scooter that it doesnt has a battery and works on 6 volt its a honda camino

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alex4421 (author)2007-09-23

its a scooter that's above 20 years old it doesn't has a battery, now i found another way to make it , but now i have otherproblem.

the light's are in serie i putted a diode in the circuitwhen i brake it gets the full 6 vomlt ,but also does my front light
rear:
http://www.youtube.com/watch?v=i0e5S2zkfpk
front:
http://www.youtube.com/watch?v=ekZ4xG6526g

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Patrick Pending (author)alex44212007-09-23

The lights will definitely not be wired in series. I think you understanding of serial is a bit muddled.

As for "the full 6 vomlt " I think you should see a doctor ;-)

Cheers,

Pat. Pending

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alex4421 (author)2007-09-22

and if my scooter is standing still all light are getting 3 volt ac and on 50 km/h the lights get about 6 volt

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Goodhart (author)alex44212007-09-22

You are then looking to "regulate" the voltage?

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alex4421 (author)2007-09-22

i do have have 5 watt becuase the front light and rear light are in serie( not parrallel) . the front light is in connection and if i dont replace it good ,then it could be that the there will be another current on the two light band the front or rear will break,... because when you disconnect the frontlight from my honda camino the rear light get over 36 volt ac !!

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LasVegas (author)alex44212007-09-22

Without a schematic (wiring diagram) of your scooter, I couldn't properly diagnose your problem.

What I can tell you is that your lamps are not connected serially since you would have no power to the front lamps if the rear were disconnected if that were the case. Reading the voltage with an AC meter will likely give you unreliable information. It's more likely that the generator used to recharge the starter battery as well as power the lamps is not well filtered and producing an irregular pulsating DC. This could give really weird reading on an AC digital meter.

It is possible that the rectifier circuit between the generator and power distribution has failed. This would explain the unreliable AC readings throughout the wiring harness. This could also cause your battery to fail or not charge at all.

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