Terminal designations - DIN 72552
The terminal markings laid down in this Standard for motor vehicle electrical systems, are to ensure as faultless a
connection as possible of electrical apparatus, especially in the event of repair of replacement units.
The development of new equipment necessitates the use of multi-pole connectors for which the terminal markings
according to DIN 72552 are no longer adequate. For these, a numerical or alphabetical sequence is used, that has no
particular relation to the functions concerned.
Ignition/supplementary systems, battery, motors
1 Low voltage (ignition coil, distributor)
Distributor with two separate circuits
1a To contact breaker 1
1b To contact breaker 2
2 Short-circuit terminal (magneto ignition)
4 High voltage (ignition coil, distributor)
Distributor with two separate circuits
4a From ignition coil 1, terminal 4
4b From ignition coil 2, terminal 4
7 Base series resistor to or from ignition distributor (control
switch contact)
15 Switched positive output from battery, ignition switch output
15a Output at ballast resistor to ignition coil
17 Glow-plug and starter switch, starting
19 Glow-plug and starter switch, preheating
30 Input direct from battery positive
30a Series-parallel switch
Input from battery 2 positive with 12/24 V systems
31 Return direct to battery, negative or ground
31b Return to battery negative or ground via switch or relay
(switched negative)
Electric motors
32 Return*
33 Main terminal connection*
33a Cycle completion switch off
33b Shunt field
33f For second, lower speed
33g For third, lower speed
33h For fourth, lower speed
33L Anti-clockwise rotation
33R Clockwise rotation
(*Polarity change possible at terminals 32-33)
Generator, regulator, starting, lighting systems
44 Voltage compensation at generator regulators, with two or more
generators operated in parallel
45 Output at separate starting relay, input at starter motor (main
current)
For parallel operation of two starter motors
45a Starter relay output for engaging current to starter motor 1
Input of starter motors 1 and 2
45b Starter relay output for engaging current to starter motor 2
Control of starting
48 Terminal at starter motor and start repeating relay
49 Indicator (pulse generator), input
49a Indicator (pulse generator), output
49b Indicator output, second indicator circuit
49c Indicator output, third circuit
50 Starter motor control (direct)
50a Starter motor control (indirect), battery change-over relay
50b Starter motor control with parallel operation of two starter motors
50c Input for starter relay for starter motor 1 for sequence control of its
actuating current.
For parallel operation of two starter motor
50d Input for starter relay for starter motor 2 for sequence control of its
actuating current.
For parallel operation of two starter motors
50e Start locking relay, input
50f Start locking relay, output
50g Start repeating relay, input
50h Start repeating relay, output
51 DC voltage at rectifier of AC generator
51e DC voltage at rectifier of AC generator with choke coil for daytime
driving
52 Tyre pressure drop indicator or other signal transmission for trailer to
towing vehicle
53 Wiper motor, input (+)
53a Wiper (+), parking
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 Stop lamps
54g Electromagnetically operated pneumatic valve for retarder in trailer
55 Fog lamps
56 Headlamps
56a Upper beam and upper beam indicator
56b Lower beam
56d Headlamp flasher contact
57 Sidelamp for motor cycles, (also cars, trucks, etc)
57a Parking lamps
57L Parking lamp, left
57R Parking lamp, right
58 Sidelamp, tail, number plate and instrument panel lamps
58b Tail lamp switch-over for two wheel tractors
58c Trailer plug and socket for single line tail lamp, fused in trailer
58d Adjustable instrument panel lighting
58L Tail and side marker lamps, left
58R Tail and side marker lamps, right, number plate lamp
59 AC voltage, output rectifier input
59a Charging armature, output
59b Tail lamp armature, output
59c Stop lamp armature, output
61 Charge indicator
63 Generator regulator, regulated voltage
63a Generator regulator, current limitation
64 Transistor regulator, generator current limitation, control lead
71 Tone sequence control unit, input
Tone sequence control unit, output
71a to horns 1 and 2, low
71b to horns 1 and 2, high
72 Alarm switch (rotating beacon)
75 Radio, cigarette lighter
76 Loudspeaker
77 Door valve control heading switches
Switches
81 Input to break contact and to change-over contact
Break contact and change over contact (break-contact side)
81a Output 1
81b Output 2
82 Make contact, input
82a Make contact, output 1
82b Make contact, output 2
82z Make contact, input 1
82y Make contact, input 2
83 Multi-position switch, input
Multi-position switches
83a Output, position 1
83b Output, position 2
83L Output, position left
83R Output, position right
Relays
84 Current relay input end of winding
84a Output end of the winding
84b Output
85 Electromagnetic actuator, output (output end of the winding, negative
or ground)
86 Electromagnetic actuator, input (input end of the winding)
86a Electromagnetic actuator, input (input end of the winding, or first
winding)
86b Electromagnetic actuator, input (winding tap or second winding)
87 Input to relay break-contact or to relay change over contact
Relay break contact or, relay change-over contact (break-contact side)
87a Output 1
87b Output 2
87c Output 3
Relay break-contact or relay change-over contact
87z Input 1
87y Input 2
87x Input 3
88 Relay make-contact input
Relay make-contact or relay change-over contact (make contact side)
88a Output 1
88b Output 2
88c Output 3
Relay make-contact or relay change-over contact
88z Input 1
88y Input 2
88x Input 3
Generator, generator regulators
B+ Battery positive
B- Battery negative
D+ Dynamo positive
D- Dynamo negative
DF Dynamo field
DF1 Dynamo field 1
DF2 Dynamo field 2
Alternator
U.V.W. Individual phase terminals
Alternator with separate rectifier
J Exitation winding positive
K Exitation winding negative
Mp Mid-point terminal
Direction indicators
C First indicator lamp
CO Main terminal for indicator circuits separate from the
indicator relay
C2 Second indicator lamp
C3 Third indicator lamp (i.e. for two-trailer operation)
L Indicator lamp, left
R Indicator lamp, right
