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LEDs on AC bike

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  • #1

    LEDs on AC bike

    Hi guys, need some electrical/ electronics help. I want to use some decorative LEDs on my bike, a P-180 UG3. The bike has an AC/DC system. I intend to wire the LEDs so that they come on with the pilot & No. plate lamps.

    I have got spare connectors for the rear No. plate lamp so that i can wire the LEDs in parallel with it, without modifiying the wiring harness in any way.
    ie wiring harness supply connectors (F) -> spare M - LEDs in parallel here - spare F -> No. plate lamp connector (M).

    My problem is, the supply here is AC if im correct. How will this affect the LED's? Will they die soon? They will flicker right? Constant on/off? Reverse voltage?
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  • #2
    Query approved.
    (Been There Done That) x 3.25

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    • #3
      Can i use a rectifier here? My power requirement will be lees than 5W. I'm thinking of using a 4 x diode, 1 x cap, 1 x 7812 IC setup. Will this work? What diodes and capacitor will i need? Please help.

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      • #4
        Yes it sure works. Just that the LED output will fluctuate.

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        • #5
          Won't the capacitor remove the fluctuation? And also are there prebuilt rectifiers available?

          Also, please tell me about the supply in the P-180 UG3. Voltage range, Frequency, phase(s)? I really dont know anything about the genreator/alternator, what exactly is it?
          Last edited by Ayson; 04-17-2011, 01:36 PM.

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          • #6
            why don't you connect them to battery via a small switch, will be much easier than installing a rectifier.
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            • #7
              Originally posted by princesirohi View Post
              why don't you connect them to battery via a small switch, will be much easier than installing a rectifier.
              That way, i'll need to switch it on separately everytime, also anyone else can switch it on even when the bike is parked, or i can accidently leave it on.

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              • #8
                In addition to voltage rectifier 7812 you need a current limiter ckt to make sure the LEDs receive constant current.
                First collect the details of the current/voltage you are going to rectify/regulate like voltage from idle to max, type of voltage(AC or something else) because in Uni and Xtreme the current that drives the lights has reverse polarity wrt ground and varies from 1~7 v DC, still couldn't figure out what type of current it is because this current drives 12v 35/35 bulbs but reads 1~7 volts DC.

                Also see if you can use relay from the switch and draw current directly from battery to illuminate the LEDs.

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                • #9
                  I thought of the relay, but that too needs 12VDC. LEDs i have are those strips that have a circuit built in, its just plug and play .

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                  • #10
                    The LCD console most probably runs on DC. You can connect the LEDs to the wire that supplies DC to the meter. It will glow when the meter glows.
                    Your biking tells a lot about the person you are!

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                    • #11
                      Originally posted by Ayson View Post
                      Hi guys, need some electrical/ electronics help. I want to use some decorative LEDs on my bike, a P-180 UG3. The bike has an AC/DC system. I intend to wire the LEDs so that they come on with the pilot & No. plate lamps.

                      I have got spare connectors for the rear No. plate lamp so that i can wire the LEDs in parallel with it, without modifiying the wiring harness in any way.
                      ie wiring harness supply connectors (F) -> spare M - LEDs in parallel here - spare F -> No. plate lamp connector (M).

                      My problem is, the supply here is AC if im correct. How will this affect the LED's? Will they die soon? They will flicker right? Constant on/off? Reverse voltage?

                      Dude use the tail light connector. There are 3 wires in the tail light connector. One is the common ground, one is the tail light[dull one that glows when the pilot lamps are turned on] and the other is the brake light[the bright one that glows when you hit the brakes.]

                      Use the tail light connector. It is DC and the decorative LEDs will glow only when you put the headlight switch to the pilot position.

                      Refer http://www.xbhp.com/talkies/do-yours...e-simpler.html

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                      • #12
                        @abhijeet080808 I do not have the option of cutting and splicing into the OEM wiring harness.

                        @pavanchirmade I am trying source the connector for the brake light.

                        But i have an LED for the No. plate lamp, so i will need to rectify anyway.

                        Here are my current doubts. Does anyone know the range of AC voltage on the Pulsar. ie idle to high RPM? Also, is a rectifier at the no. plate wire end, going to create any problem.

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                        • #13
                          Dude it is not a special connector. Break open a bulb and you get two terminals..

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                          • #14
                            Can anyone tell me how much resistance is needed for lightning 3v leds from Bike battery.
                            Who needs a stereo when you've got a throttle ? ( Time to turn up the volume.)

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                            • #15
                              Originally posted by Anuragxtreme View Post
                              Can anyone tell me how much resistance is needed for lightning 3v leds from Bike battery.
                              1k will suffice your requirement.. higher than this will result in dim lit LED.

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