Have a 1976 R90/6 purchased new in 1976. Do not live on it as I used to, actually the last several years have seen perhaps a good two hour ride the entire season. This year did a Master Cylinder Rebuild then proceeded to start it up. Problem is that there is no Headlight. In troubleshooting the wiring in the Headlamp Circuit the problem seems to be with the Horn/ Light Switch. Removed the Switch from the Handlebar and started to dismantle the components.

First the small Cir-clip was removed from the On/Off Switch and was pulled out with difficulty as the Ball Spring got snagged between the plastic shaft and the housing.

Next job was to remove the rest of the components from the housing. On inspection it looked like the only way I was going to remove the remaining two switches was to dismantle the High/Low Beam Switch to allow the components to be removed. This Switch once removed, allowed the entire inside assembly to be removed. Was able to see why the High/Low Beam switch had been so sloppy. The Small Metal Ball Bearing which locates into Detents in that Switch Housing was missing. Proceeded to clean and reassemble the High/ Low Beam Switch using the Metal Ball from the On/ Off Switch which was going to be the last to be reinstalled.

Following this, the Horn Switch was disassembled, cleaned and reassembled.

With the On/ Off Switch jury rigged was able to test the functioning of the Switch.

As it turns out the internal assembly without the On/ Off Switch must be assembled as a unit. Man was it a struggle! The Hi/Low Beam Switch must be in the Hi Beam location and that part of the internal assembly has to be inserted first. The Horn Button must be pressed while exerting a lot of pressure and pulling on the Housing to get it to snap together. Final assembly is going to have to wait until a Small Metal Ball Bearing can be found.

Before starting the disassembly, looked at my BMW info (several Haynes Manuals) and on the internet and found very little. Will likely cannibalize one of my other /6's til mine gets fixed or the new one from Capital Cycle gets purchased.

Was wondering if anyone has any experience with these switches?