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Old 08-31-2014, 09:32 AM   #1
DustyOne OP
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Terminal Board help for R75/6

I posted the question at the end of my wiring/light issues post but have not gotten any help. Maybe it was just not read.
So I am just posting the separate question here.

Bike: R75/6 1975
Part: Terminal Board
Help: Haynes HardCover Book color wiring diagram

The Question:
Haynes shows on the wire diagram that there is a terminal 15a

The ACTUAL BMW OEM Terminal Board DOES NOT have any 15a terminals
BUT
it DOES HAVE 15u terminals

So.............do I just hook up my wires AND ASSUME the 15u "IS THE SAME AS 15a"????

Anyone have experience on this???

Anyone have an OPEN HEADLIGHT and see the same thing??
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Old 08-31-2014, 10:43 AM   #2
Bill Harris
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Hmm, never heard of a "15u" terminal. It may be some oddball "USA designation" that DIN (their standards board) has used. Or it may be a misprint.

I'd trace it it out and see what the terminal does when it's switched. "15" is more a descriptor than the "u".

Here is the whole DIN wiring alphabet:

Quote:
Ignition system
1 coil, distributor, low voltage
1a, 1b distributor with two separate circuits
2 breaker points magneto ignition
4 coil, distributor, high voltage
4a, 4b distributor with two separate circuits, high voltage
7 terminal on ballast resistor, to distributor
15 battery+ from ignition switch
15a from ballast resistor to coil and starter motor

Starter
50 starter control

Battery
15 battery+ through ignition switch
30 from battery+ direct
30a from 2nd battery and 12/24 V relay
31 return to battery- or direct to ground
31a return to battery- 12/24 V relay
31b return to battery- or ground through switch
31c return to battery- 12/24 V relay

Turn indicators
49 flasher unit in
49a flasher unit out, indicator switch in
49b out 2. flasher circuit
49c out 3. flasher circuit
C 1st flasher indicator light
C2 2nd flasher indicator light
C3 3rd flasher indicator light
L indicator lights left
R indicator lights right
L54 lights out, left
R54 lights out, right

AC generator
51 DC at rectifiers
51e as 51, with choke coil
59 AC out, rectifier in, light switch
59a charge, rotor out
64 generator control light

Generator, voltage regulator
61 charge control light
B+ battery +
B- battery -
D+ dynamo +
D- dynamo -
DF dynamo field
DF1 dynamo field 1
DF2 dynamo field 2
U, V, W AC three phase terminals

Lights
54 brake lights
55 fog light
56 spot light
56a headlamp high beam and indicator light
56b low beam
56d signal flash
57 parking lights
57a parking lights
57L parking lights left
57R parking lights right
58 licence plate lights, instrument panel
58d panel light dimmer

Relay
85 relay coil -
86 relay coil +
Relay contacts
87 common contact
87a normally closed contact
87b normally open contact
88 common contact 2
88a normally closed contact 2
88b normally open contact 2

ADDED:


And the color coding is standardized:
Quote:
The following colors are for the main body color of the wire.

BL blue...usually, not always, oil pressure, ALT (GEN) lamp; alternator

BR brown...always the ground, battery negative, frame ground.

GE yellow...low beam

GR grey(gray)...rear lights

GN green... usually, not always, ignition coil connection

RT red...battery, and often from the light switch and ignition switch

SW black...usually, not always, the starter, and some functions to the ignition coil and starter

VI violet

WS white...high beam

--Bill
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Bill Harris screwed with this post 08-31-2014 at 03:29 PM Reason: Added color code info
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Old 08-31-2014, 01:12 PM   #3
DustyOne OP
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Bill
Thanks for that detail
I must print it out and stick-it somewhere

I will look at that board again...MAYBE the "u" has lost the top off of the original a???

If the a is printed just like all of those rounded a letters we hand-scribed in the 1st grade.....it would be the answer I guess.

more to come.....
dusty
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Old 08-31-2014, 01:57 PM   #4
DustyOne OP
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Terminal Board 61 131 243 012

15U:
Has 2 terminals on Solid Green right next to the 2 fuses marked 15

And it has 2 more terminals at bottom left but colored green w/blue stripe. These 2 terminals are between the 85 terminals and the 31 terminals on the bottom row.




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Old 08-31-2014, 03:20 PM   #5
Big Bamboo
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It's the same board as shown in the MaxBMW fiche, so I'd ignore the "a" and "u" markings and make sure the green and grey wires attached there have no stripes. The solid green wire comes from the ignition switch...
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Old 08-31-2014, 03:36 PM   #6
Bill Harris
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I just added color code info to my above post. ^^^^ That is very standardized, too.

Green is an ignition wire powering the coil (or maybe electronic ICM). I'll betcha that the 15u terminals are fused connections from 15. Ditto 58/58u (Gray).

I'm finishing up work on my bike this PM, I'll hit that wiring schematic later...

--Bill
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Old 09-10-2014, 07:22 PM   #7
DustyOne OP
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Bill
That sounds great
I will feed this info into my brain and roll it around with that other loose/mis-placed information.
Maybe.....no, I am certain, that at some point down in the near future more and more of this will be dissolved into BMW Electronic Flow and Connection Knowledge.
Thus, it will all be folded into a proper baked pie.
(a completed and finished product all ready for consumption/use)....
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Old 09-10-2014, 07:33 PM   #8
DustyOne OP
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Quote:
Originally Posted by Bill Harris View Post
I just added color code info to my above post. ^^^^ That is very standardized, too.

Green is an ignition wire powering the coil (or maybe electronic ICM). I'll betcha that the 15u terminals are fused connections from 15. Ditto 58/58u (Gray).

I'm finishing up work on my bike this PM, I'll hit that wiring schematic later...

--Bill


yes, after more thinking and looking, I agree.

Looking at the placement of the 15 and the green w/black stripe terminal board color, which is for wires sporting that green w/black stripe designation.
AND THEN, right next to it is THE FUSE.....and then right next on the right is the ALL GREEN WIRE landing patch AND the 15 Terminal


AND THEN OF COURSE, repeat the same logic on the 58 terminal position, gray w/black stripes, the fuse, and then the 58u with only gray

AND MAYBE the "u" stands for something in Deutsche

later,
-dusty
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