Forums 🚥 PIT STOP 🔧 Hyosung Technical Help Bike not starting, electrics not working but cranks

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    • #4377
      Josh D
      Member
      • Topics: 4
      • Replies: 4
      Joined:
      Dec 16, 2019
      @joshhyogt125r2015
      North wales
      Hyosung GT125R 2015
      Points: 62

      Hi, I have a problem with my 2015 gt125r. I have tried to start the bike but nothing is happening, non of the electrics are working(lights, dash, etc). I have tried jump starting the bike, that’s not working. It does crank though, but wont run.

      I think it is the regulator thats faulty.

      And also it has a GD 250 cdi unit in it aswell from last owner, is that a problem.

      About 2 weeks ago it started fine when I turned the ignition on and off multiple times.

    • #4378
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Joined:
      Dec 16, 2019
      @mf448kxn6
      North UK
      GTR
      Points: 4,203
      Hey,
      Have you checked the following (these cut sparks off anytime its not sensed)
      • Side stand switch (bypass it, if not already by wire joins and tape it hard)
      • Clutch handle switch (don’t bypass but check the bullet connectors are still intact)
        (Temporary bypass may be ok, but not forever, you don’t want to start while gearbox is active and bike drops on the floor even damage the gearbox or starter motor)
      • Check plugs going to the cdi unit arent cut
        M795 GT125 | M815 GT125 | M815 GT250 =  These 3 cdi’s  are okay to use.
      • Check the neutral sensor wire behind sprocket cover is still plugged and showing green on the screen.

      Next when it is safe to do so,  take out a plug and put it back inside the coil CAP ,  place the pug on the valve cover bolt (silver bolt!!)  , then check for sparks when it is cranking over

      • Battery should be 12.8-13.4v cold charged and 14BS is the size,  smaller capacity batteries tend to annoy charge systems and the bike in general.

      Let us know how you get on before we try to dig deeper in to it.  Exactly the steps you took above ^ .

      If you can’t see your dash lights turn on,  check the fuse thats under the pillion seat. It’s 15A size.   Then also lift up the dash surrounding unit, be sure water didnt get to the plugs, thats enough to ruin the circuit board on the bike then doesn’t turn on again (sensetive LCD!)

      Also check plugs that are under the airbox, you willl see why its crucial to protect the area where water from the front tyre is flicking towards the carb and bounces around your connectors , turning them rusty … contact cleaner helps and then use ACF50 inside every single terminal pin, to soak them and stay protected from road salts even. Hyos really hate caked up plugs and water invastions near electronics.  The RC is a little more exposed than the old gen bikes and uses a weaker made loom, so protect it all you can.

      // Meditation doesn't mean you have to sit still....

    • #4380
      Josh D
      Member
      • Topics: 4
      • Replies: 4
      Joined:
      Dec 16, 2019
      @joshhyogt125r2015
      North wales
      Hyosung GT125R 2015
      Points: 62

      Hi Josh’s dad here . Problem we have is there is no ignition or dash lights , no horn or lights ect nothing on starter button? It turns over as normal if cross starter solenoid, took off and sprayed every connector I can see including the fused one under back seat ? Any help would be very much appreciated b4 I break lockdown and push it off a cliff !

    • #4382
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 366
      Joined:
      Dec 16, 2019
      @mf448kxn6
      North UK
      GTR
      Points: 4,203

      Hi Josh’s dad here . Problem we have is there is no ignition or dash lights , no horn or lights ect nothing on starter button? It turns over as normal if cross starter solenoid, took off and sprayed every connector I can see including the fused one under back seat ? Any help would be very much appreciated b4 I break lockdown and push it off a cliff !

      Bloody hell, that’s a poorly machine, if you can’t see the dashboard turn on. We must inspect the harness..

      So,

      • Go to rear pillion seat, confirm the fuse is still intact and 15A?
      • Disconnect the regulator/rectifier on the left frame (temporarily!)
      • Lift the tank, and “click this blue link here”  ….
        Only follow #1 – #6 on how to remove the airbox.
      • Now look for these plugs:
        GREEN BLOCK = Ignition barrel (crucial)
        BLACK BLOCK = Kill Switch unit / right SW gear.
        BLUE BLOCK = Dashboard harness.

      Also, please confirm the GREEN BLOCK has 12.8v going to the ignition barrel (no less)

      Also last thing, confirm when the key turns – Do the “headlights” come on ?   The bike’s headlights will always come on upon key turning.

      The “NEUTRAL” light LED will also come on  (even if the LCD glass is turned off, which i hope not as that’s a circuit failure potentially or a damaged harness / shorted somehow)

      So please advise on what you did as above and report your progress …

      // Meditation doesn't mean you have to sit still....

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