BMW K bikes (Bricks)

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1Back to top Go down   Solid state resistor Empty Solid state resistor on Tue Feb 21, 2017 8:44 pm


Gold member
Gold member
Not a 'K' question I'm afraid but but some one who is an electronics guru might be able to answer as the internet has failed me. 
I have a small Russian two stroke with 12v direct lighting, no battery. there is some form of solid state resistor in the brake light circuit, presumably, to stop surge blowing the bulb. Three connections power, earth and switch.  It has failed ie no circuit. Can any one point me in the direction of a suitable European alternative? John

1992 K75RT  1979 IZH Planeta3

2Back to top Go down   Solid state resistor Empty Re: Solid state resistor on Tue Feb 21, 2017 11:20 pm


active member
active member
k100virgin wrote:there is some form of solid state resistor

Zener diode maybe? I think the battery would be optional in the below diagram The Zener regulates the voltage in this ckt

Solid state resistor Tridiode

Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA
1989 K100RS SE

1979 BMW R65
1980 BMW R65
1982 BMW R80RT (Gas hog)
1974 BMW R90/6
1972 BMW R75
1964 BMW R50 Earles forks( as reliable as a hammer)
2009 Buel XB12R (the FI sucked)
1999 Buell  (Yeah! a carburetor)
2005 Suzuki Bandit 1200
1991 Kaw ZX-11 OMG
1966 Norton 750 (had to have a chase car for anything over 5 miles)
1961 Norton 650' (see above)
1964 Honda 305 Superhawk
and a dozen or so I have forgotten about..........

3Back to top Go down   Solid state resistor Empty Re: Solid state resistor on Wed Feb 22, 2017 11:22 am


Life time member
Life time member
I'm with Wilcom. Quite few versions of grey porridge had direct AC lighting with a DC brake light and horn powered direct from the battery. DC (battery) charging was provided by a zener diode - get one for a Triumph Bonneville or similar.

I like the red and blue on Wilcom's diagram - if you put a pair of anaglyph 3D glasses on it jumps out at you.

'83 K100 upgraded to K100RS spec, '87 K100RT
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California

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