Question about 1978 Yamaha XS 500

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I have a 1978 yamaha xs500 bike and there is a weird electrical issue i have run through the wires and there are o brakes yet the power from the battery is not going to anything no lights nothing. Have checked everything with a multimiter even bypassed the wires that start from the battery but still nothing, Any ideas?

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  • celph_tit315 Feb 18, 2009

    Yeah there is no power going to anything on the bike yet everything that i hook a multimeter up to seems to be in working order everything has resistance where needed and the continuity is fine but I could be missing some obvious thing that I over looked.

  • Murtaza Akberali  Versi
    Murtaza Akberali Versi May 11, 2010

    Hi Celph,

    Can you please elaborate , when you mention there is no power, does it mean that there is totally no power going to the complete system of the bike ,or just the head and the brake lights?



    Knight. (Yamaha Seca XJ750 A 1981)

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Have you checked the ground side of things?, to complete an electrical circuit you need ground. try running your own external ground directly from battery neg. post to individual components . that will tell you if it is pos. wires or neg. wires are good or bad.that is a very old bike,check harness ground to frame and motor for rust and corrosion,check all connections and clean and scrape shiny again, but do not bend or break connector pins.as a last resort you might consider fabricating or buying wiring harness if in very corroded & dry rotted condition.

Posted on Feb 19, 2009

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I guess the rear brakes system of your bike must be mechanical.
Remove the rear adjusting nut on the brake rod and thn try it , the wheel should rotate freely.
If no, thn theres a problem in the drum and the linnings.. you will hve to remove the back wheel and examine.
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