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RPM vs Headlight vs Horn.

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  • #1

    RPM vs Headlight vs Horn.

    How is RPM related to horns?

    Okay, here's the scenario. I went to a local shop to buy engine oil for my dad's bike. This question of mine stems from that shop.

    Customer (on scooter - Priya) - The horn doesn't sound.
    Mechanic - Change it!
    C - Why change? 1st check it...
    .
    .
    .
    .
    (~15 min later)
    M - Okay. Wires were loose. It works.
    C - Hmm... I'll take a T.D and confirm.

    C - It works sometimes only!
    When I switch on the headlight, it doesn't sound. Why?
    M -
    .
    .
    .
    (~10 min later)
    M - The wiring is faulty!
    C - Are you nuts? Wait, let me see.
    <!-- He wrings the throttle hard, revs it so hard that the scooter starts puffing white smoke. But, the horn sounds with the headlight on! -->

    C - See, it sounds.
    M -
    M - Wait, I'll call my uncle. He knows better.
    .
    .
    .
    .
    (~20 mins.... Nobody came.)

    Since, I'd already lost close to an hour in this drama and my mom started calling me every 5 min, I decided to leave.
    What could be the reason for that man's problem?
    What maybe the solution?

    Update:-
    A few senior members said that 'Priya' scooter didn't have a battery. So, that being faulty is ruled out.
    Last edited by Divya Sharan; 03-02-2012, 09:48 PM. Reason: Changes needed for clarification.
    Got a $5 head? Get a $5 helmet.
    Because everyone who passes, isn't a martyr!

    Bullet Service Guide CBR 250R Parts Manual Fz16 service manual - https://drive.google.com/file/d/0B1-...VFQmJzakk/view
    Hero Moto Corp Bikes' Parts RE STD 350 Wiring Diagram (CI) Service Manual - Classic 350/500
    ZMR parts - https://drive.google.com/file/d/0B-U...it?usp=sharing
    P200NS Spares' prices - https://docs.google.com/spreadsheet/...taGd5R2c#gid=0
    Tags: None
  • #2
    Query approved.
    (Been There Done That) x 3.25

    Comment

    • #3
      Certainly the battery. But this should go in the humor thread..


      Blog : Mumbai - Leh - Mumbai : 21 Days, 6500kms. Journey to Heaven..June'09
      GreatIndianRide - West India on a 110cc for over a month
      Mumbai-Leh-Mumbai - A Sequel : July'11 (Blog coming soon)

      Comment

      • #4
        If you are lucky - Your battery needs juice. In case of maintenance free battery, buy a new battery.
        In case of stock battery, just go to a battery shop for putting distilled water and check the readings

        If you are unlucky, your alternator is dying which is why its not charging the battery.
        Replance the alternator
        Super CommuTOURer� - Talk less, Ride more

        .: FB :.|.: TW :.|*IG*| Ex         PowerDrift:.

        #Give thy opinion, write em, dont throw em
        #Everyone errs, accept it, defending/cribbing about it only makes it worse
        #Dont defend a manufacturer as if you work for them
        #Write. Think. If relevant hit submit. If not hit yourself
        #Be kind in your choice of words, you never know who would make you gulp em
        � Satyen Poojary

        Comment

        • #5
          Originally posted by Divya Sharan View Post
          How is RPM related to horns?
          Engine revs the dynamo that generates power & charges the battery that powers the horns

          Originally posted by Divya Sharan View Post
          When I switch on the headlight, it doesn't sound. Why?
          Short circuit or improper grounding + this guy should not be having a fuse; so things go unnoticed; add to that the battery is weak.

          Originally posted by Divya Sharan View Post
          He wrings the throttle hard, revs it so hard that the scooter starts puffing white smoke. But, the horn sounds with the headlight on!
          More power generated to power the headlight as well as supply the battery

          Satyen - Its a question on behalf of someone whom he noticed & no his issue as such
          Skill is what keeps you on a Motorcycle
          Awareness + Skill is what keeps you out of harm's way
          ATGATT + Awareness + Skill means you might Live To Ride another day

          Comment

          • #6
            He says the scooter was a 'Priya'. If I recall correctly 'Priya' was a clone of the early Bajaj Chetak, therefore, it does not have a battery. So the horn would not work unless the engine was running and ditto for the headlight.
            Only a biker knows why a dog sticks his head out of a car window.

            Multum in Parvo - Much in Little

            "Yes, it is FAST! No, you CAN'T ride it!" - http://www.xbhp.com/talkies/general-...a-300-san.html

            Comment

            • #7
              Originally posted by abhimanyu31 View Post
              therefore, it does not have a battery
              Good catch; I agree with you
              Skill is what keeps you on a Motorcycle
              Awareness + Skill is what keeps you out of harm's way
              ATGATT + Awareness + Skill means you might Live To Ride another day

              Comment

              • #8
                Originally posted by rachitkohli View Post
                Certainly the battery. But this should go in the humor thread..
                Ya it sounds funny, but the problem also is unique.

                Originally posted by satyenpoojary View Post
                If you are lucky - Your battery needs juice. In case of maintenance free battery, buy a new battery.
                In case of stock battery, just go to a battery shop for putting distilled water and check the readings

                If you are unlucky, your alternator is dying which is why its not charging the battery.
                Replance the alternator
                +
                Originally posted by aargee View Post
                Engine revs the dynamo that generates power & charges the battery that powers the horns


                Short circuit or improper grounding + this guy should not be having a fuse; so things go unnoticed; add to that the battery is weak.


                More power generated to power the headlight as well as supply the battery

                Satyen - Its a question on behalf of someone whom he noticed & no his issue as such
                +
                Originally posted by abhimanyu31 View Post
                He says the scooter was a 'Priya'. If I recall correctly 'Priya' was a clone of the early Bajaj Chetak, therefore, it does not have a battery. So the horn would not work unless the engine was running and ditto for the headlight.
                +
                Originally posted by aargee View Post
                Good catch; I agree with you
                Means - There is no battery as such...
                Then what could the problem be?
                Got a $5 head? Get a $5 helmet.
                Because everyone who passes, isn't a martyr!

                Bullet Service Guide CBR 250R Parts Manual Fz16 service manual - https://drive.google.com/file/d/0B1-...VFQmJzakk/view
                Hero Moto Corp Bikes' Parts RE STD 350 Wiring Diagram (CI) Service Manual - Classic 350/500
                ZMR parts - https://drive.google.com/file/d/0B-U...it?usp=sharing
                P200NS Spares' prices - https://docs.google.com/spreadsheet/...taGd5R2c#gid=0

                Comment

                • #9
                  Originally posted by Divya Sharan View Post
                  Ya it sounds funny, but the problem also is unique.


                  +

                  +

                  +


                  Means - There is no battery as such...
                  Then what could the problem be?
                  It means Headlight is eating all power generated by alternator in low rpm & horn getting nothing resulting in weak or no sound . But in high rpm power is high enough to run both headlight & horn .

                  Comment

                  • #10
                    Originally posted by Above_All View Post
                    It means Headlight is eating all power generated by alternator in low rpm & horn getting nothing resulting in weak or no sound . But in high rpm power is high enough to run both headlight & horn .
                    So that means, if the wiring is changed, the problem maybe solved. Because I don't see any reason why the headlight should eat all the power generated. There has to be fault in the electrical circuit only.
                    Isn't it?
                    Got a $5 head? Get a $5 helmet.
                    Because everyone who passes, isn't a martyr!

                    Bullet Service Guide CBR 250R Parts Manual Fz16 service manual - https://drive.google.com/file/d/0B1-...VFQmJzakk/view
                    Hero Moto Corp Bikes' Parts RE STD 350 Wiring Diagram (CI) Service Manual - Classic 350/500
                    ZMR parts - https://drive.google.com/file/d/0B-U...it?usp=sharing
                    P200NS Spares' prices - https://docs.google.com/spreadsheet/...taGd5R2c#gid=0

                    Comment

                    • #11
                      Originally posted by abhimanyu31 View Post
                      He says the scooter was a 'Priya'. If I recall correctly 'Priya' was a clone of the early Bajaj Chetak, therefore, it does not have a battery. So the horn would not work unless the engine was running and ditto for the headlight.
                      & aargee

                      Ah! Yes...! Caught off gaurd!
                      - Check if the scoot has the stock headlight
                      - Wiring
                      - Relay
                      - Alternator
                      Last edited by satyenpoojary; 03-03-2012, 02:43 PM.
                      Super CommuTOURer� - Talk less, Ride more

                      .: FB :.|.: TW :.|*IG*| Ex                       PowerDrift:.

                      #Give thy opinion, write em, dont throw em
                      #Everyone errs, accept it, defending/cribbing about it only makes it worse
                      #Dont defend a manufacturer as if you work for them
                      #Write. Think. If relevant hit submit. If not hit yourself
                      #Be kind in your choice of words, you never know who would make you gulp em
                      � Satyen Poojary

                      Comment

                      • #12
                        Originally posted by Divya Sharan View Post
                        Means - There is no battery as such...
                        Then what could the problem be?
                        Originally posted by Divya Sharan View Post
                        So that means, if the wiring is changed, the problem maybe solved. Because I don't see any reason why the headlight should eat all the power generated. There has to be fault in the electrical circuit only.
                        Isn't it?
                        The earlier scooters Bajaj M-50, Bajaj Super, Lambratta etc didn't had any battery. Its directly powered by the dynamo. High revving will produce more power, brighter will be the headlight and more sound from horn. If the headlight n horn is used simultaneously, the power gets divided, headlight dims and horn weakens. Regarding the electrical circuit, it had very less technology and the wiring was straight forward. And wiring gets damaged over years!

                        Had and used dad's '87 model Bajaj Super!

                        Comment

                        • #13
                          No,The electricity generation at low RPM is not sufficient to run both headlight and horn simultaneously.
                          How much current do you expect from a puny Alternator of a Priya ?

                          Comment

                          • #14
                            Originally posted by Divya Sharan View Post
                            So that means, if the wiring is changed, the problem maybe solved. Because I don't see any reason why the headlight should eat all the power generated. There has to be fault in the electrical circuit only.
                            Isn't it?
                            Originally posted by shoeb2015 View Post
                            No,The electricity generation at low RPM is not sufficient to run both headlight and horn simultaneously.
                            How much current do you expect from a puny Alternator of a Priya ?
                            That is i wanted to say , Priya O Re Priya !!!!!!

                            Comment

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