From Bosch Automotive Handbook, 3rd edition

Terminal Designations (Excerpts from DIN Standard 72 552) The terminal designations do not identify the conductors, because device with different terminal designations can be connected at the two ends of each conductor. If the number of terminal designations is not sufficient (multiple-contact connections), the terminals are consecutively numbered using numbers or letters whose representations of specific functions are not standardized.

TerminalDefinition
IGNITION
1Ignition 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)
4Ignition coil, ignition distributor, high voltage
Ignition distributor with two separate electrical circuits
4afrom ignition coil I, terminal 4
4b from ignition coil II, terminal 4
15Switched + downstream of battery
(output of ignition/driving switch)
15aOutput at dropping resistor to ignition coil and starter
GLOW PLUG AND STARTER SWITCH
17Start
19Preheat
BATTERY
30input from + battery terminal, direct
30ainput from + terminal of battery II
(12/24 V series-parallel battery switch)
31Return line to battery - battery terminal or ground, direct
31bReturn ine to negative battery terminal or ground, via switch or relay
(switched negative)
(12/24 V series-parallel battery)
31aReturn line to - terminal of battery II
31cReturn line to - terminal of battery I
ELECTRIC MOTORS
32Return line
(Polarity reversal possible at terminals 32-33)
33Main terminal connection
(Polarity reversal possible at terminals 32-33)
33aSelf-parking switch-off
33bShunt field
33fFor second lower-speed range
33gFor third lower-speed range
33hFor fourth lower-speed range
33LCounterclockwise rotation
33RClockwise rotation
STARTER
45Separate starter relay output; starter input (main current)
45aOutput, starter I
Input, starters I and II (Two-starter parallel operation)
45bOutput, starter II (Two-starter parallel operation)
48Terminal on starter and on start-repeating relay for monitoring starting procedure
TURN SIGNAL FLASHER
49Input
49aOutput
49bOutput, second turn-signal circuit
49cOutput, third turn-signal circuit
STARTER
50Starter control (direct)
50aOutput for starter control
(Series-parallel battery switch)
50bStarter control with parallel operation of two starters with sequential control
50cInput at starting relay for starter I
(Starting relay for sequential control of the engagement current during parallel operation of two starters)
50dInput at starting relay for starter I
(Starting relay for sequential control of the engagement current during parallel operation of two starters)
50eInput, Start-locking relay
50fOutput, Start-locking relay
50gInput, Start-repeating relay
50hOutput, Start-repeating relay
ALTERNATOR
51DC voltage at rectifier
51eDC voltage at rectifier with choke coil for daytime driving
TRAILER SIGNALS
52Signals from trailer to towing vehicle, general
WIPER MOTOR
53Wiper motor, input (+)
53aWiper (+), self-parking switch-off
53bWiper (shunt winding)
53cElectric windshield-washer pump
53eWiper (brake winding)
53iWiper motor with permanent magnet and third brush (for higher speed)
TRAILER SIGNAL
54For lamp combinations and trailer plug connections
TRAILER STOP LAMP
54gPneumatic valve for additional retarding brake, electromagnetically actuated
LIGHTING
55Fog lamps
56Headlamp
56aHigh beam, high-beam indicator lamp
56bLow beam
56dHeadlamp-flasher contact
57Side-marker lamp: motorcycles, mopeds. Abroad also cars, trucks, etc.
57aParking lamp
57LParking lamp, left
57RParking lamp, right
58Side-marker lamps, tail lamps, license-plate lamps and instrument-panel lamps
58bTail-lamp changeover for single-axle tractors
58cTrailer plug-and-receptacle assembly for single-conductor tail-lamp cable with fuse in trailer
58dVariable-intensity instrument-panel lamp, tail-lamp and side-marker lamp
58LSide-marker lamp, left
58RSide-marker lamp, right; license-plate lamp
ALTERNATOR (magneto, generator)
59AC voltage, output, rectifier, input
59aCharging armature, output
59bTail-lamp armature, output
59cStop-lamp armature, output
61Alternator charge-indicator lamp
TONE-SEQUENCE CONTROL DEVICE
71Input
71aOutput to horns 1 & 2, low
71bOutput to horns 1 & 2, high
72Alarm switch (rotating beacon)
INTERIOR
75Radio, cigarette lighter
76Speaker
77Door-valve control/td>
SWITCHES
Break-contact and changeover switches
81Input
81a1st output, break side
81b2nd output, break side
Make-contact switches
82Input
82a1st output
82b2nd output
82z1st input
82y2nd input
Multiple-position switches
83Input
83aOutput, position 1
83bOutput, position 2
83LOutput, left-hand position
83ROutput, right-hand position
CURRENT RELAY
84Input, actuator and relay contact
84aOutput, actuator
84bOutput, relay contact
SWITCHING RELAY
85Output, actuator (end of winding to ground or negative)
86Start of winding
86aStart of winding or 1st winding
86bWinding tap or 2nd winding
Relay contact for break and changeover contacts
87Input
87a1st output (break side)
87b2nd output
87c3rd output
87z1st input
87y2nd input
87x3rd input
Relay contact for make contact
88Input
Relay contact for make and changeover contacts (make side)
88a1st output
88b2nd output
88c3rd output
Relay contact for make contact
88z1st input
88y2nd input
88x3rd input
ALTERNATOR and VOLTAGE REGULATOR
GENERATOR and GENERATOR REGULATOR
B+Battery positive
B-Battery negative
D+Dynamo postive
D-Dynamo negative
DFDynamo field
DF1Dynamo field 1
DF2Dynamo field 2
Alternator with separate rectifier
JExcitation winding positive
KExcitation winding negative
MpCenter point terminal
U,V,WAlternator terminals
DIRECTION INDICATOR (turn-signal flasher)
CFirst indicator lamp
C0Main terminal connection for separate indicator circuits actuated by the turn-signal switch
C2Second indicator lamp
C3Third indicator lamp (e.g., when towing two trailers)
LTurn-signal lamps, left
RTurn-signal lamps, right

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