Miscl. Electrical 
©
38-B
misclelectrical.htm

I also have just about every schematic for every motorcycle, even the C-1 'scooter', and accessories too for all bikes, for those made between late 1969 (when the /5 came out) and early 2006.  Some of these are e-mailable, but are large files in general...please don't ask unless you have a REAL need, as I am on dialup service!!

(1) The Hazard warning lights system, standard.   This is a 15067 pixel .gif.  You will need to download it to your imaging program, you will need to expand its size in your imaging program to see the finer details.    This is a schematic diagram from the Factory Service Manual, for 1983.  It is typical of the Hazard lamps function circuitry.  The item in the upper left corner is the normal flasher unit, the wire leading upward goes to the turn signal switch on the handlebars.  This normal flasher unit is used for the hazard function and normal function, on the airheads.  The function of this circuit is a bit convoluted.   When the ignition switch is turned on, Relay (8) at the lower right is then energized, and power flows through that relay to both the flasher terminal 49, and to terminal 30 on the hazard switch, item (7).  When the hazard switch is turned ON, power comes from terminal 49d of that switch, keeping relay (8) powered on, even if the ignition switch is then turned off (until the hazard switch is turned off).   The purpose of diode (4) is to prevent the circuitry from backfeeding the rest of the motorcycle.    When the hazard switch is turned ON, the hazard switch, via the R and L terminals, puts all the turn lamps in parallel...so all are energized.    The turn signal switch and individual lamps, and wiring to the flasher is not shown on this schematic, but it is standard.

(2) Here is a hyperlink to a schematic diagram for the 1978 bikes.  There are very minor differences with the Euro and US bikes.   This diagram is quite useful for most all of the airhead models. http://powerboxer.de/images/stories/2v/reparatur/schaltplaene/im_05_strich7_78_schaltplan_e.gif

(3)  This is schematic diagram from the Factory Service Manual for the optional fold-out lamps for the fairings, called 'Additional Driving Lights'....and consists of a fog light and a driving light, and associated parts.  This is a reasonable sized .gif format, of 576 x 630 pixels, and can be downloaded into your imaging program, and you can use the zoom feature, and all necessary small fine details will show up quite well.

Nebelscheinwerfer is the fog light; Zusatzfernscheinwerfer is the driving light.   
As with all BMW wiring sketches:
BR = braun, brown, common chassis ground
RT = rot, red
GE = gelb, yellow
GN = grün, green
WS = weib, white
BL = blau, blue
GR = grau, gray
SW = schwarz, black
VI = violett, violet
TR = transparent, transparent

(4).  VDO instruments:   It is possible to substitute VDO instruments, such as:
voltmeter:  #332-103
clock: #370-152
Those are black face and black bezels, and have a threaded part to mount them, rather than the bracket.
You can also use VDO Vision Marine voltmeters and clocks.

revisions:
11-14-2005:  add (2)
12-24-2005:  Add (3)
03/12/2006:  Add (4)
05/17/2007:   Remove original poor scan of Hazard circuit and replace with high resolution scan
09/25/2007:  Modify both images, both are now .gif, and are detailed enough for good usability
                        if downloaded to an image program and zoom feature used.