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Ac to D.C. Ktm voltage conversion

Posted: Thu Apr 27, 2017 4:35 pm
by Madizm
So I ordered an led tail light to replace my broken setup. After checking output voltage I realize that it is AC voltage. Led light wants D.C. Has anyone done this easily? I don't want to convert whole bike yet. Just tail. I can use bridge rectifier but any suggestion?

2011 Ktm 450 xcw


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Re: Ac to D.C. Ktm voltage conversion

Posted: Thu Apr 27, 2017 5:28 pm
by Laoch
I would think Sicass, Baja Designs or Trail tech would have everything you need?
It's not like the wheel being reinvented.

Quick look- none of them list any type of rectifier. I put LED tails on a couple of bikes and just wired it up. No problems.
Only turn signals I think need help?

Re: Ac to D.C. Ktm voltage conversion

Posted: Thu Apr 27, 2017 5:32 pm
by juddspaintballs
I tried a bridge rectifier on my 250 EXC 2T a while ago. It wasn't the cleanest signal, but it did work. It should be fine for the LED tail as long as it's got a reasonable range of something like 3 to 24V or so since mine often spiked around 16V when I was on the throttle.

I also think Baja Designs makes a cheap kit you can add on to your bike to convert it to DC easily and far cheaper than a Trail Tech setup. I was lazy and just dropped a Trail Tech stator into my 450 EXC.

Re: Ac to D.C. Ktm voltage conversion

Posted: Thu Apr 27, 2017 6:29 pm
by Madizm
juddspaintballs wrote:I tried a bridge rectifier on my 250 EXC 2T a while ago. It wasn't the cleanest signal, but it did work. It should be fine for the LED tail as long as it's got a reasonable range of something like 3 to 24V or so since mine often spiked around 16V when I was on the throttle.

I also think Baja Designs makes a cheap kit you can add on to your bike to convert it to DC easily and far cheaper than a Trail Tech setup. I was lazy and just dropped a Trail Tech stator into my 450 EXC.

Thanks guys.

I heard the rectifier would need a switch to turn off so it's not draining battery when the bike is not in use?

I have 10.4 ac and want to run a 12vdc. Thinking rectifier would work. I think I actually have one at work. Not taking this on road so I'm just looking out for people behind me Image


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Re: Ac to D.C. Ktm voltage conversion

Posted: Thu Apr 27, 2017 6:40 pm
by juddspaintballs
At one point on that 250 EXC, I even ran a fire alarm battery (sealed and tiny) with direct wiring for the tail light and computer fan I used on the radiator. I calculated the draw on it, and if I left the fan and brake light on continuously, it would run for something like 33 hours straight. It was really simple and required no special wiring into the bike's harness.

Re: Ac to D.C. Ktm voltage conversion

Posted: Thu Apr 27, 2017 8:54 pm
by frogman1981
You don't need to rectify for a light emitting DIODE. Rectifiers are just diodes themselves.

Re: Ac to D.C. Ktm voltage conversion

Posted: Fri Apr 28, 2017 8:42 am
by Madizm
Just to update. After reviewing the schematics of the xcw model, it turns out I only have a tail light. No brake indicator. Basically the exc models come with front and rear integrated brake switches which light the tail light brighter when applied. I have no such thing. So an inline rectifier to my light should suffice. It just stays on.

While the LED is a diode my understanding is the led is not designed for this type of application. (we have an electrical engineer at my office)

Re: Ac to D.C. Ktm voltage conversion

Posted: Fri Apr 28, 2017 12:10 pm
by Wingfixer
I'm still scratching my head over a dirt bike using house electricity. :screwy:





:killingme:

Re: Ac to D.C. Ktm voltage conversion

Posted: Fri Apr 28, 2017 12:46 pm
by gots_a_sol
LEDs typically only work on DC power but I believe Joe Volk put an led tail on his new bike and it worked ok on AC. :shrug:

Re: Ac to D.C. Ktm voltage conversion

Posted: Fri Apr 28, 2017 1:46 pm
by frogman1981
Diodes work on ac and dc. Diodes are used in a rectifier to create D.C. From ac. Your led works on ac and dc. You could build a rectifier using leds.