DIN 72552

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DIN 72552 is a DIN standard for labeling the electric terminals in automotive wiring. The most frequently used labels are listed in the table below.

Contact Meaning Old terminal designation[1]
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 16
15a from ballast resistor to coil and starter motor 16
15e battery+ from ignition switch, also when starter motor runs
Preheat (Diesel engines)
15 preheat in +
17 start
19 preheat (glow)
45 starter relay 30f, 30h
45a starter 1 output 30h, 30h I
45b starter 2 output 30h II
50 starter control
50a starter control
50b starter control 50
50c starter control 50 II
50d starter control 50b, 50k
50e starter control 50a
50f starter control 50
50g starter control 50a
50h starter control 50
15 battery+ through ignition switch 16, 54/15
30 from battery+ direct 30/51
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 85d
31c return to battery- 12/24 V relay 31, 31a
Electric motors
32 return 31
33 main terminal (swap of 32 and 33 is possible) 30
33a limit
33b field 54e
33f 2. slow rpm
33g 3. slow rpm
33h 4. slow rpm
33L rotation left 30L
33R rotation right 30R
49 flasher unit in 15, 15+, 15/54, +, +15
49a flasher unit out, indicator switch in 54L, S, S4
49b out 2. flasher circuit
49c out 3. flasher circuit
C 1st flasher indicator light K, K1, P
C2 2nd flasher indicator light K1, K2, K3, K4
C3 3rd flasher indicator light K3, K4
L indicator lights left HL, L54, VL
R indicator lights right HR, R54, VR
L54 lights out, left SBL
R54 lights out, right SBR
AC generator
51 DC at rectifiers
51e as 51, with choke coil
59 AC out, rectifier in, light switch 51, 51-, 51a
59a charge, rotor out 59
64 generator control light
Generator, voltage regulator
61 charge indicator (charge control light)
B+ battery + 51, 51B+, B+30, B+51
B- battery - 31B-
D+ dynamo/alternator diode+
D- dynamo/alternator diode-
DF dynamo field
DF1 dynamo field 1
DF2 dynamo field 2
U, V, W AC three phase terminals
54 brake lights
54g lights 54
55 fog light N
56 spot light
56a headlamp high beam and indicator light
56b low beam F
56d signal flash
57 parking lights
57a parking lights P
57L parking lights left PL
57R parking lights right PR
58 licence plate lights, instrument panel
58d panel light dimmer 58b
58L parking light 58
58R parking light 58
Window wiper/washer
53 wiper motor + in 1, 3, 54d, S
53a limit stop + 54, +2
53b limit stop field 3, 54e
53c washer pump
53e stop field 1, 2
53i wiper motor with permanent magnet, third brush for high speed
Acoustic warning
71 beeper in H
71a beeper out, low
71b beeper out, high
72 hazard lights switch
85c hazard sound on
81 opener
81a 1 out
81b 2 out
82 lock in
82a 1st out
82b 2nd out
82z 1st in
82y 2nd in
83 multi position switch, in
83a out position 1
83b out position 2
85 relay coil - Important if relay coil has flyback diode in parallel
86 relay coil + Important if relay coil has diode in parallel
Relay contacts
87 common contact 30/51
87a normally closed contact
87b normally open contact
88 common contact 2 30/51 (relay)
88a normally closed contact 2
88b normally open contact 2
52 signal from trailer
54g magnetic valves for trailer brakes
75 radio, cigarette lighter R
77 door valves control

EN 50005[edit]

A different standard, European Norm (EN) 50005 recommends terminal numbering for general application relays (e.g. 11/12/14/A1/A2 for a SPDT relay) that may nevertheless be applied to automobiles.


  1. ^ "vintagebus.com". Archived from the original on 2016-09-19. Retrieved 2016-10-20.