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Automobile electric terminal numbers according to DIN 72552
For almost every contact in a car there is a number code to standardize car wiring. These numbers are defined in DIN 72552.
Contact Meaning Ignition system 1 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 engines ) 15 preheat in 17 start 19 preheat (glow) 50 starter control 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 to battery- 12/24 V relay 31b return to battery- or ground through switch 31c return to battery- 12/24 V relay Electric motors 32 return 33 main terminal (swap of 32 and 33 is possible) 33a limit 33b field 33f 2. slow rpm 33g 3. slow rpm 33h 4. slow rpm 33L rotation left 33R rotation right 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 L indicator lights left R indicator lights right 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, rotor out 64 generator control light Generator, Generator voltage regulator 61 charge control light B+ Battery + B- Battery - D+ Dynamo + D- Dynamo - DF Dynamo field DF1 Dynamo field 1 DF2 Dynamo field 2 U, V, W AC three phase terminals lights 54 brake lights 55 fog light 56 spot light 56a high beam and indicator light 56b low beam 56d signal flash 57 parking lights 57a parking lights 57L parking lights left 57R parking lights right 58 licence plate lights, instrument panel 58d panel light dimmer window wiper/washer 53 wiper motor + in 53a limit stop+ 53b limit stop field 53c washer pump 53e stop field 53i wiper motor with permanent magnet, third brush for high speed acoustic warning 71 beeper in 71a beeper out, low 71b beeper out, high 72 hazard lights switch 85c hazard sound on switches 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 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
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