Front brake switch

[MEZ]

Motonerds, you're help needed here, not sure if there is a solution but I'll ask anyway. See attached pic of a BMW R1200adv front brake switch. I'm using it on my K75 special build which has GSA switchgear/brake/clutch levers etc. My question is this : The config of this switch is N/O which is fine in a rational and logic world BUT.... When fitted correctly into it's place of rest the switch works in the complete opposite config. Basically the rear light is on all the time and when lever is actuated the brake light goes off. Being an electrician and reasonably good at automation I've had a look at the mechanical side and physical actuation of the lever against switch position etc etc and have resided that the fitment of the switch is so as to work with CANbus and therefor is closed (closed circuit) when at rest and open circuit when brakes are applied. That may be correct to work with the ECU but I have wired the switch directly into the K75 loom and getting the opposite working config of what I need...!!

Does anyone have any idea if there is a normally closed (N/C) BMW switch the same as this one in existence...???


IMG_4143.JPG (65.37 kB . 768x576 - viewed 276 times)

[kioolt]

As a retired industrial maintenance electrician what you are describing is what I would call a normally open held closed switch.  Meaning that when installed it is held in the actuated position.   I may be wrong but I believe this is the normal switch for use in a ABS equipped bike.  Again, I may be wrong but I believe that if you were to get a switch for the same bike without ABS you will find that it is normally closed before installing and will be open when installed.  (Normally closed held open).

[MEZ]

Hi Kioolt, think were on the same page here, The bmw guy from where I bought it from was saying similar but then went on to say that part numbers were all the same switch. When the switch is installed correctly the switch is compressed (switched) with the lever at rest which is putting the rear light ON. What I want and basically what you said is the switch to be N/C and when installed it compresses and becomes in the N/O mode, brake applied then it switches back to the closed position and BOOM.... rear light is reenergised....

[kioolt]

If you can't find a normally closed switch you could use the one you have if you add a relay to the circuit.