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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: pinhead on June 06, 2026, 10:02:12 PM

Title: ignition switch replacement on 1992 K75S
Post by: pinhead on June 06, 2026, 10:02:12 PM

I am in process of removing ignition switch regarding suspected failure.  I can not find any sources for oem replacement in US.  Are there any aftermarket switches that work well?  thanks

Title: Re: ignition switch replacement on 1992 K75S
Post by: Laitch on June 07, 2026, 05:06:36 AM

There are a few detailed threads in the Workshop about successfully using aftermarket switches, but if you're looking for new OEM-style, Euro Motoelectrics has these. (https://www.euromotoelectrics.com/product-p/ignswitch412.htm)

Title: Re: ignition switch replacement on 1992 K75S
Post by: pinhead on June 20, 2026, 01:35:25 PM

I ouched at that price so I decided to take apart ignition switch my self and rebuild.  Did not find that much corrosion inside the contacts but when I put together again and installed, problem went away.  Now I got to work on the warning lights.  the low fuel light, the overheating light, and the discharging light come on sporadically and then go off. 

Title: Re: ignition switch replacement on 1992 K75S
Post by: Edward on June 20, 2026, 04:01:34 PM

Please keep us updated on your findings and solutions.

Title: Re: ignition switch replacement on 1992 K75S
Post by: daveson on June 21, 2026, 07:56:31 AM

I'm assuming these three lights come on and go off at the same time. One quick test I would try would be to remove the blue wire from the alternator. If that also stops the other two lights from flashing on and off again, the alternator might be the problem area.

It would probably be good to check the voltage across the battery before this test.

Title: Re: ignition switch replacement on 1992 K75S
Post by: TriSpark on June 21, 2026, 02:24:59 PM

I've fixed a sticking or non-working ignition switch on my K75 and other bikes by throwing it in the ultrasonic cleaner for 10 minutes, then drying it off overnight. Often times it's gummed up old grease or foreign muck in there that makes them stop working. It's always worth a try before splashing out the $$$ on a replacement. I did the same with a bad starter solenoid, and it also started working again.