
DIN 72552 is a DIN standard for automobile electric terminal numbers, standardizing almost every contact in an automobile with a number code.
This table gives most frequently used numbers.
Contact Meaning
Ignition System
1 Ignition 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
Preheat Diesel Engine
in
15 preheat
17 start
(glow)
19 preheat
Starter
control
50 starter
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
battery- 12/24 V relay
to
battery-
or ground through switch
to
31b return
battery- 12/24 V relay
31c return
to
Electric Motors
32 return
33 main terminal (swap of 32 and 33 is possible)
33a limit
33b field33f 2. slow rpm
33g 3. slow rpm
33h 4. slow rpm
33L rotation
left
right
33R rotation
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
left
L indicator
lights
right
lights
R indicator
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,
out
rotor
light
generator
control
Generator, Voltage Regulator 61 charge indicator (charge control light)
+
B+ battery
-
B- battery
D+ Dynamo / alternator diode +
diode-
D- dynamo/alternator
DF dynamo
field
1
DF1 dynamo
field
2
DF2 dynamo
field
U, V, W AC three phase terminals
Lights
lights
54 Brake55 fog
light
light
56 spot
56a Headlamp high beam and indicator light
beam
56b low
flash
56d signal
lights
57 parking
57a parking
lights
left
lights
57L parking
lights
right
57R parking
58 licence plate lights, instrument panel
58d panel light dimmer
Wiper / Washer
53 wiper motor + in
53a limit stop +
53b limit stop field
pump
53c washer
field
53e stop
53i wiper motor with permanent magnet, third brush for high speed
Acoustic warning
71 Beeper
in
71a beeper out, low
high
71b beeper
out,
switch
lights
72 hazard
85c hazard sound on
Switches
81 opener
81a 1
out
out
81b 2
in
82 lock
out
82a 1st
out
82b 2nd
in
82z 1st
in
82y 2nd
83 multi position switch, in
1
position
83a out
83b out position 2
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 Additional 52
signal from trailer 54g magnetic valves for trailer brakes 75 radio, cigarette lighter 77 door valves control
