Question about 1991 BMW K 75 S

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Electrical issue on K75s.

Electrical failure on K75s. Starter won't turn over, no front lights, only '1' flash of left hand signal when you push any of the turn /cancel buttons!!!, no horn. However with a gear engaged and the bike rocked backwards and forwards it appears the starter motor disengages and allows all the electrics to work fine! It then starts fine but usually means I loose all the lights and only have the '1' flash of the left turn signal back again! Whats going on here?

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  • neilstone13 Sep 06, 2009

    Had the starter out the other day and everything seemed fine. I was thinking it may be the spragg clutch failing to disengage but couldn't work out how this would effect the electrics. Swapped the starter relay with a known good one and no difference. Am waiting for a load shedding relay to try that. Have checked all the earths and disconnected and cleaned them. New battery fitted about a month ago and all terminals are clean. Have removed handle bar switches and sprayed with copious amounts of WD40.
    The only other problem that I have noticed is that even when all the electrics are working fine the front brake light does not work (rear is OK) but I am expecting this to be just the switch and not the cause of the other problems. Have yet to check out the switch. Cheers, Neil


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If the motor rocked foward/backwards then things seemed to start working its not the starter motor. It sounds like the motor is resting or putting tension or have melted/shorted some electrical wires and when it rocks foward/backward releases the tension on wiring causing the random shorting. Check all your electrical wiring around the motor and make sure none look to be too tight or under pressure.Depending on you setup you may need to pull the fairings off for a full inspection

Posted on Sep 06, 2009

  • James Brooks
    James Brooks Sep 06, 2009

    Keep in mind that WD40 is a lubricant not electrical contact cleaner and is highly flammable. It won't do much for corroded connections if they are shorting. Try to purchase some electrical contact cleaner that dissolves after about 5-10 seconds and cleans any oxidation. Also you can purhase some dielectric grease for the fittings after they have been repaired or replaced to lock ou moisture.


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