Question about 1982 Yamaha XJ 650

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Hlight won't work check fuses check relay still no power at light rear light works

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  • mike soucy Aug 31, 2010

    there is no power no where at the light i will check at switch (hi &lo beam the only one i have)

  • mike soucy Sep 01, 2010

    can you tell me witch relay i replace the one near the flasher relay it has power on one pin but the light won't work can i install the hlight direct with a switch

    thanx mike

  • mike soucy Sep 06, 2010

    I will get back at you this week to let you know if it work since i just got back from out of town

  • mike soucy Sep 06, 2010

    Hi again i got the light to work but now the bike won't start it was fine last time except for the light it only sputter could it be the new relay i put on for the light because at one point it almost started but the diode in the headligtht got grilled so i replace it but to no avail i might of burnt that one too

    thanks mike

  • mike soucy Sep 08, 2010

    when i burnt the diode i had just change a relay on the side of the bike i notice later that it had a yellow mark on it



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Check at the headlight connector. Measure resistance between Black wire and battery negative. Should be 0 ohm. Alternatively connect a test light between this black and battery positive, it should light up. This proves the lights earth.
Next check the hi/lo switch connector.The yellow and the green wires will have power alternately as you switch between hi and lo beam. The third wire (Yellow and red if I recall) should have power(12V)

Posted on Sep 01, 2010

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  • Rene Rossouw
    Rene Rossouw Sep 01, 2010

    Checking for power on the hi/ lo switch should be done with the engine running.
    Cut the engine again. Switch ignition to "on". Measure voltage at the headlight fuse(between the fuse and battery negative) with the fuse removed. On one side you will find 0Volt and the other 12V. If not check the voltage between battery negative and all the wires under the ignition key. All 3 should be 12 Volt with the ignition switched on and connected. If correct then the wire between headlight fuse and ignition switch is faulty. Run a new one between the fuse and ignition.
    If you found 12 Volt at the fuse check the Red/yellow at the relay for 12V. If not present replace wire (R/Y) between relay and fuse. If present measure voltage between blak wire and battery negative. Should be 0 Volt.(with ignition on) If not - bad relay earth wire. Replace wire.
    More to follow shortly.

  • Rene Rossouw
    Rene Rossouw Sep 01, 2010

    I've drawn up a wiring diagram for the lights. Note the following:

    • R - Red wire

    • L - Blue wire

    • Br - Brown wire

    • RY - Red/Yellow wire

    • LB - Blue/black wire

    • B - Black wire

    • W - White wire

    • G - Green wire

    • Y - Yellow wire

    • Main - Main fuse

    • Head - Headlight fuse

    • Relay - Headlight relay, identify by checking wire colors on the connector

    • 3/4/6 pin - Connectors, identify by the amount (3/4/6) positions on the connector

    • H/bar sw - handle bar switch

    • Hi/lo sw - Hi/lo beam switch

    • Hi - hi beam filament in headlight globe

    • Lo - Lo beam filament in headlight globe

    • Diode - Small magic box-o'-trix identify by wires : 2 white, 1 Blue/white, 1 black/red, 1 black white, 6pin connector

    • Alt - Alternator

    • Meter - meter lights

    • + : positive on battery

    • - : negative on battery

    • IGN - ignition switch

    Start the engine.Measure voltage at the 3 pin connector at the alternator. It has 3 white wires. Voltage should be present on all 3 and increase with revs. If not the alternator coils are bad - replace.
    Next check the white wire on the relay for voltage. If none present the diode is bad - replace.
    You cannot hardwire the headlight directly from the battery as it will overtax one of the 3 coils on the alternator and also cause low voltage to the rest of the system. The head lights are powered off one of the 3 coils(taillights off the battery), while the other 2 are used for recharging the battery and supplying auxilliary power.

  • Rene Rossouw
    Rene Rossouw Sep 07, 2010

    How did you get the light to work if the engines not running. It shouldnt come on when the engine is not running. If you are burning through diodes then there is something wrong with the wiring or the alternator coils. Disconnect the alternator 3-way plug. Measure resistance between each of the 3 pins on the alternator side. The 3 measurements should be the same. Also measure between each of the pins and earth. The measurement should be 0 ohm. Switching the relay with a new one will have no effect. To confirm switch the old one back. Confirm that you have good spark at the plugs before you start digging about the wiring.

  • Rene Rossouw
    Rene Rossouw Sep 09, 2010

    If you are blowing the diode you will have to check the alternator stator coils.
    How? - Measure between the 3 white wires on the 3 pin connector for resistance(connector disconnected). They should all be the same. Measure between each of the pins and earth. Should be infinate resistance(no reading). If not the alternator coils are bad.
    Also measure the alternator rotor coil (2 pin connector, Green and brown wires)


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Check that you got power coming from your headlight switch, then check that it is getting to the relay, then from the relay to the headlight bulb.

If you got not power from the switch replace your switch.
If you got not power from the relay replace the relay.
If you got power coming from those components then check for broken wiring.

Let me know if you need more information.



Posted on Sep 01, 2010

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I'm assuming the bulb is good. If the fused link is not blown and the relay is good, then you should be getting voltage to the hot side of the circuit to the light? No? If not, then you should be getting voltage to the hot side at the switch?

Posted on Aug 31, 2010


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