This applies to the dash switches
used in K75s, K100s, K1s, K1100s and a few R bikes of the
same era. The switches can become dirty inside making
them not operate so well or the wiring breaks where it's
soldered to the terminals on the back of the switch.
Here's a PDF of switch and switch
insert part numbers:
Remove the switch from it's slot. If mounted in one of the
soft dash pads, with a little wiggling you can usually pull
them out from the front. If they're mounted in hard plastic
then you'll need to use a small screwdriver or whatever from
depress the prongs that hold the switch in place.
Disconnect the switch from the wiring harness. I usually do
the switch rehab in situ on the bike but there are tiny bits
to lose so I'd recommend doing this at the workbench your
first time out.
Use small screwdrivers on both sides to pry the top part of
the switch off. It pivots on a couple of nylon nipples. It's
easiest to pop both sides at once which is why I use two
This is the step where you can
lose tiny bits. In the rocker is a little tube holding a
spring and a little part at the end which, when translated
into English by German engineers, is called the little
(Optional) If the graphic insert on the switch is
worn you can push it out from the inside. A replacement
can be had from BMW for about $4-5. They just pop right back
in and make the switch look brand new again.
From the side pry the back off of the switch. For some
reason it seems to go easier if you do it on the side with
the wire terminals. Now you see the little slider inside and
understand how the switch works.
Clean the contacts on the slider and the back of the switch.
I usually just scrape them with one of my little
screwdrivers until I see shiny copper.
Clean/lubricate the switch. Soak a Q-tiip in silicone, WD-40
or whatever you lubricant of choice is. Clean out the inside
of the switch where the slider goes and the sides of the
Also do the upper outside of the
switch body and the inside of the rocker.
Check the wiring. If a few strands of the wire have broken
or it's broken altogether then it's time to get the
soldering iron out.
Melt the solder on the terminal and remove the old wire. You
have to be careful doing this so as not to heat the terminal
so much that it melts the plastic it's mounted in.
When you melt the solder, clean
out the hole it in with a tack or needle to make room for
the wire to pass through.
Cut the old end of the wire off and strip about 1/4 inch. It
helps to put some soldering flux on the wire. Then put it
through the hole and resolder it.
Put the slider in and snap the back on.
Put the rocker back on. Before you do this use a pen or
something to get the slider in a halfway position. Put the
rocker on it's back (otherwise the little hollow phallus
will escape) and push the switch straight into it.
© 2013 Drake Smith - Please do
not use or reproduce this elsewhere. Feel free to link
to it though.