Bus structure and pinning naming conventions:



You mean like these?

This is DIN standards stuff. Wally had a handout a bunch of SITMs ago...


Amazingly enough, there's a DIN standard, 72552, that has a number for every bit of automotive wire terminal they could think of. You can find the numbers at http://en.wikipedia.org/wiki/DIN_72552



Terminal Definition
1 Ignition coil, ignition distributor, low voltage
Ignition distributor with two separate electrical circuits
1a to ignition contact breaker I
1b to ignition contact breaker II
2 short-circuit terminal (magneto ignition)
4 Ignition coil, ignition distributor, high voltage
Ignition distributor with two separate electrical circuits
4a from ignition coil I, terminal 4
4b from ignition coil II, terminal 4
15 Switched + downstream of battery
(output of ignition/driving switch)
15a Output at dropping resistor to ignition coil and starter
17 Start
19 Preheat
30 input from + battery terminal, direct
30a input from + terminal of battery II
(12/24 V series-parallel battery switch)
31 Return line to battery - battery terminal or ground, direct
31b Return line to negative battery terminal or ground, via switch or relay
(switched negative)
(12/24 V series-parallel battery)
31a Return line to - terminal of battery II
31c Return line to - terminal of battery I
32 Return line
(Polarity reversal possible at terminals 32-33)
33 Main terminal connection
(Polarity reversal possible at terminals 32-33)
33a Self-parking switch-off
33b Shunt field
33f For second lower-speed range
33g For third lower-speed range
33h For fourth lower-speed range
33L Counterclockwise rotation
33R Clockwise rotation
45 Separate starter relay output; starter input (main current)
45a Output, starter I
Input, starters I and II (Two-starter parallel operation)
45b Output, starter II (Two-starter parallel operation)
48 Terminal on starter and on start-repeating relay for monitoring starting procedure
49 Input
49a Output
49b Output, second turn-signal circuit
49c Output, third turn-signal circuit
50 Starter control (direct)
50a Output for starter control
(Series-parallel battery switch)
50b Starter control with parallel operation of two starters with sequential control
50c Input at starting relay for starter I
(Starting relay for sequential control of the engagement current during parallel operation of two starters)
50d Input at starting relay for starter I
(Starting relay for sequential control of the engagement current during parallel operation of two starters)
50e Input, Start-locking relay
50f Output, Start-locking relay
50g Input, Start-repeating relay
50h Output, Start-repeating relay
51 DC voltage at rectifier
51e DC voltage at rectifier with choke coil for daytime driving
52 Signals from trailer to towing vehicle, general
53 Wiper motor, input (+)
53a Wiper (+), self-parking switch-off
53b Wiper (shunt winding)
53c Electric windshield-washer pump
53e Wiper (brake winding)
53i Wiper motor with permanent magnet and third brush (for higher speed)
54 For lamp combinations and trailer plug connections
54g Pneumatic valve for additional retarding brake, electromagnetically actuated
55 Fog lamps
56 Headlamp
56a High beam, high-beam indicator lamp
56b Low beam
56d Headlamp-flasher contact
57 Side-marker lamp: motorcycles, mopeds. Abroad also cars, trucks, etc.
57a Parking lamp
57L Parking lamp, left
57R Parking lamp, right
58 Side-marker lamps, tail lamps, license-plate lamps and instrument-panel lamps
58b Tail-lamp changeover for single-axle tractors
58c Trailer plug-and-receptacle assembly for single-conductor tail-lamp cable with fuse in trailer
58d Variable-intensity instrument-panel lamp, tail-lamp and side-marker lamp
58L Side-marker lamp, left
58R Side-marker lamp, right; license-plate lamp
ALTERNATOR (magneto, generator)
59 AC voltage, output, rectifier, input
59a Charging armature, output
59b Tail-lamp armature, output
59c Stop-lamp armature, output
61 Alternator charge-indicator lamp
71 Input
71a Output to horns 1 & 2, low
71b Output to horns 1 & 2, high
72 Alarm switch (rotating beacon)
75 Radio, cigarette lighter
76 Speaker
77 Door-valve control/td>
Break-contact and changeover switches
81 Input
81a 1st output, break side
81b 2nd output, break side
Make-contact switches
82 Input
82a 1st output
82b 2nd output
82z 1st input
82y 2nd input
Multiple-position switches
83 Input
83a Output, position 1
83b Output, position 2
83L Output, left-hand position
83R Output, right-hand position
84 Input, actuator and relay contact
84a Output, actuator
84b Output, relay contact
85 Output, actuator (end of winding to ground or negative)
86 Start of winding
86a Start of winding or 1st winding
86b Winding tap or 2nd winding
Relay contact for break and changeover contacts
87 Input
87a 1st output (break side)
87b 2nd output
87c 3rd output
87z 1st input
87y 2nd input
87x 3rd input
Relay contact for make contact
88 Input
Relay contact for make and changeover contacts (make side)
88a 1st output
88b 2nd output
88c 3rd output
Relay contact for make contact
88z 1st input
88y 2nd input
88x 3rd input
B+ Battery positive
B- Battery negative
D+ Dynamo postive
D- Dynamo negative
DF Dynamo field
DF1 Dynamo field 1
DF2 Dynamo field 2
Alternator with separate rectifier
J Excitation winding positive
K Excitation winding negative
Mp Center point terminal
U,V,W Alternator terminals
DIRECTION INDICATOR (turn-signal flasher)
C First indicator lamp
C0 Main terminal connection for separate indicator circuits actuated by the turn-signal switch
C2 Second indicator lamp
C3 Third indicator lamp (e.g., when towing two trailers)
L Turn-signal lamps, left
R Turn-signal lamps, right
Cross-reference for old and new terminal designations in accordance with DIN 72 552. Only terminal designations whose significance has altered are given.


1 1, 53(wiper), 53e
2 2, 53e
3 53, 53b(wiper)
4 4, 53a, 53b(wiper)
15 15, 49(turn-signal flasher)
15+ 49
15/54 15, 49, 54
16 15a, 15
30 30, 33(motor)
30/51 30, 87, 88(relay)
30f 45
30h 45, 45a
30h I 45a
30h II 45b
30L 33L (motors)
30R 33R (motors)
31 31, 31c, 32(motors)
31a 31a, 31c
31B- B-
50 50, 50b, 50f, 50h
50a 50, 50a, 50e, 50g
50b 50d
50k 50d
50 II 50c
51 51, 59, B+
51 - 59
51a 59
51B+ B+
54 54, 53a, 54g
54/15 15
54d 53(wiper)
54e 33b, 53b(wiper)
54L 49a
58 58, 58L, 58R
58b 58b, 58d
59 59a
85d 31b(alarm switch)
B+30 B+
B+51 B+
D+/61 D+
D-/61 D-
H 71
HL L (L54b)
HR R (R54b)
K0 C0
K1 C, C2
K2 C2
K3 C2, C3
K4 C2, C3
L54 L (L54)
N 55
P C, 57a
PL 57L
PR 57R
R R, 75
R54 R, (R54)
R54b Rb
S 49a, 53(wiper)
S4 49a
SBL (L54)
SBR (R54)
+ 15, 49(turn-signal flasher)
  53, 53a(wiper)
+2 53a
+15 49
-1 (ignition coil), 31

You failed to mention color coding. 30 is red while 15 is red with a white stripe. Black can also be ignition on as well. And of course the most common color confusion for the average American is the German use of Brown as ground. Brown with white then becomes a temporary ground as with the dome light switches. Grey is usually used for lights.

Dan the Pod Guy
Portia's Parts


One more, but now in German, lifted from a standards website:

Klemmenbezeichnung nach DIN 72552.mht