Question about 2006 Derbi Senda R 125 4T

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Revometer/headlights not working

New battery/ checked wires, told possibly magneto, is this serious?

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I dont think its magnito if other lights are working an easy way is to by pass wires to lights and rev with test wire as wires could be dead

Posted on Jan 22, 2009

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Posted on Jan 02, 2017

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1 Answer

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You have either a rectifier or charging coil(magneto) issue. The rectifier changes the AC pulse from the magneto to 12V DC. If that checks out, you'll need to test the magneto. Either case you'll need to have a multimeter handy and access to the factory repair manual for the testing parameters and wiring diagrams. Good luck!

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I checked my 1991 KLX250 service manual (wiring should be similar): the magneto has 4 wires: Yellow, Black/White, White/Green, and White/Red. Only the yellow is for the lights: the yellow goes from the magneto through a light switch (if you don't have a battery, ignore the light switch). The output side of the light switch is a Red wire. This Red wire feeds both the taillight and a headlight. The other side of the taillight is a Black/Yellow wire. There is a regulator typically in line with the light circuit to keep the voltage at 12V so as to avoid blowing the lights with over-voltage. I hope this helps.

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1 Answer

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Check output of battery when bike is idling.
If still 11 volt, then your charger, which is the magneto is faulty or the wire is broken from it to your battery. If the charge varies when you test when engine dead to engine idling, wire is fine. Should be 13 to 13.5 volt when idling if magneto is ok.

J

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