Skip to content
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
Skins
  • Light
  • Cerulean
  • Cosmo
  • Flatly
  • Journal
  • Litera
  • Lumen
  • Lux
  • Materia
  • Minty
  • Morph
  • Pulse
  • Sandstone
  • Simplex
  • Sketchy
  • Spacelab
  • United
  • Yeti
  • Zephyr
  • Dark
  • Cyborg
  • Darkly
  • Quartz
  • Slate
  • Solar
  • Superhero
  • Vapor

  • Default (Slate)
  • No Skin
Collapse
Brand Logo

DT125R FORUM

  1. Home
  2. Technical Zone
  3. Electrics
  4. DT 125 R bad headlight.

DT 125 R bad headlight.

Scheduled Pinned Locked Moved Electrics
11 Posts 8 Posters 1.1k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • 2 Offline
    2 Offline
    2stroketerry
    wrote on last edited by
    #1

    Took my DT out the other night and on unlit roads couldn't see at all and would of been brighter with a candle. When braking headlight goes nearly out even with clutch in and revving it high, battery is new and all outputs from engine exact voltage meant to be. Taped a voltmeter to handlebar so could see whats happening with lights on and revving past 10,000 it reads 14.8v. Just cruising at low revs with lights on reads around 12.4v so don't know why headlight is so bad.
    https://www.youtube.com/watch?v=aCKiCBGyKy4

    https://www.youtube.com/watch?v=AyYkYlVaTmM

    1 Reply Last reply
    0
    • BluestoesonnoseB Offline
      BluestoesonnoseB Offline
      Bluestoesonnose
      wrote on last edited by
      #2

      I've used Osram bulbs in the past to get a better result. It could be worth cleaning all the contacts checking the earths and putting LED bulbs in the other lights to ensure you get all the limited power to the front end. I've done the latter with my 1952 Triumph running 6v and a dynamo and it's helped loads.

      Lastly you can get adaptor rings to run H4 bulbs in the front, this is helpful as you can put a H4 halogen in.

      2002 DT125R

      1 Reply Last reply
      0
      • O Offline
        O Offline
        oldman
        wrote on last edited by
        #3

        As said check the earth to the headlamp, even run an independent earth to it, old looms suffer badly on the earthing side. Osram nightbreaker for me

        1 Reply Last reply
        1
        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #4

          Yeah, my first thoughts were Earths, but I wasn't really qualified to say.

          Always Originate, Never Pirate!

          1 Reply Last reply
          0
          • britshgigoloB Offline
            britshgigoloB Offline
            britshgigolo
            wrote on last edited by
            #5

            or run a led bulb set up as had the same problem on mine so converted all bulbs to led and thats worked a lot better for me

            1 Reply Last reply
            0
            • 2 Offline
              2 Offline
              2stroketerry
              wrote on last edited by
              #6

              Bought these 100/90w Super White Xenon https://www.ebay.co.uk/itm/2x-HB12-410-P45T-100-90w-Super-White-Xenon-Headlight-Bulbs-12v/191434589033
              Didn,t really make much difference so changed my battery to a 50amp 4S Lipo pack
              from a radio controlled car and half the size of DT battery. Although rated as 14.8volt fully charged they are 16.8 volts so added a resistor and a diode to make 12.8volt.
              Then got a 12volt relay used for car spotlamps etc and ran live from battery to relay
              with a 25amp inline fuse, now my original live for the high and low beam are just trigger wires for the relay.
              So when switched on now the bulb gets it's power direct from my 50amp Lipo pack and now my headlight is insane and stood in front of bike now can't look direct at the light as way too bright. Also now no longer have to start the bike to run headlight and can sit forever with headlight on now just turning on my ignition due to the 50amp hard case Lipo pack and lights unlit roads so bright and the beam can go miles now and shines brighter and further than my car spotlamps.

              NINJAN 1 Reply Last reply
              2
              • 2 2stroketerry

                Bought these 100/90w Super White Xenon https://www.ebay.co.uk/itm/2x-HB12-410-P45T-100-90w-Super-White-Xenon-Headlight-Bulbs-12v/191434589033
                Didn,t really make much difference so changed my battery to a 50amp 4S Lipo pack
                from a radio controlled car and half the size of DT battery. Although rated as 14.8volt fully charged they are 16.8 volts so added a resistor and a diode to make 12.8volt.
                Then got a 12volt relay used for car spotlamps etc and ran live from battery to relay
                with a 25amp inline fuse, now my original live for the high and low beam are just trigger wires for the relay.
                So when switched on now the bulb gets it's power direct from my 50amp Lipo pack and now my headlight is insane and stood in front of bike now can't look direct at the light as way too bright. Also now no longer have to start the bike to run headlight and can sit forever with headlight on now just turning on my ignition due to the 50amp hard case Lipo pack and lights unlit roads so bright and the beam can go miles now and shines brighter and further than my car spotlamps.

                NINJAN Offline
                NINJAN Offline
                NINJA
                wrote on last edited by
                #7

                @2stroketerry Any pics of your handywork dude???

                SEDUCED BY THE DARK SIDE!!!

                1 Reply Last reply
                1
                • 2 Offline
                  2 Offline
                  2stroketerry
                  wrote on last edited by
                  #8

                  @NINJA it's raining where I am or would do a video, I do have a spare relay and batteries etc so will wire together when I've had my tea and turn my kitchen light out and switch on, so bright can't look directly at the bulb or just see a black spot for ages everywhere you look.

                  NINJAN declanD 2 Replies Last reply
                  0
                  • 2 2stroketerry

                    @NINJA it's raining where I am or would do a video, I do have a spare relay and batteries etc so will wire together when I've had my tea and turn my kitchen light out and switch on, so bright can't look directly at the bulb or just see a black spot for ages everywhere you look.

                    NINJAN Offline
                    NINJAN Offline
                    NINJA
                    wrote on last edited by
                    #9

                    @2stroketerry COOL - Hallucinogenic lights eh??? :grinning_face_with_smiling_eyes:

                    SEDUCED BY THE DARK SIDE!!!

                    1 Reply Last reply
                    0
                    • 2 2stroketerry

                      @NINJA it's raining where I am or would do a video, I do have a spare relay and batteries etc so will wire together when I've had my tea and turn my kitchen light out and switch on, so bright can't look directly at the bulb or just see a black spot for ages everywhere you look.

                      declanD Offline
                      declanD Offline
                      declan
                      wrote on last edited by
                      #10

                      @2stroketerry my purple halos worked a treat

                      1 Reply Last reply
                      0
                      • stinkwheelerS Offline
                        stinkwheelerS Offline
                        stinkwheeler
                        wrote on last edited by
                        #11

                        Any wireing diagrams or pictures of your work please ?

                        The hills are alive with the sound of ... braaaap baaaaap 😁

                        1 Reply Last reply
                        0
                        Reply
                        • Reply as topic
                        Log in to reply
                        • Oldest to Newest
                        • Newest to Oldest
                        • Most Votes


                        • Login

                        • Don't have an account? Register

                        • Login or register to search.
                        • First post
                          Last post
                        0
                        • Recent
                        • Tags
                        • Popular
                        • Users
                        • Groups