DIN codes explained

General
Terminal	Significance
1	Low voltage (ignition coil, distributor)
4	High voltage (ignition coil, distributor)
15	Switched positive output from battery, ignition switch
15 a	Output at ballast resistor to ignition coil
30	Input direct from battery positive
31	Return direct to battery
31 b	Return to battery negative via switch or relay
48	Control of starting terminal at starter motor
49	Turn signal flasher ( pulse generator) input
49 a	Turn signal flasher output(pulse generator)
49 b	Turn signa1 f1asher output/second flasher output
49 c	Turn signal f1asher output/third flasher output
50	Starting motor control (direct)
50 a	Starting motor control output at series parallel switch
50 c	Starting motor relay input for follow up
51	DC voltage at rectifier of AC alternator
53	Wiper motor output (+)
53 a	Wiper (+), parking
53 b	Wiper (shunt winding)
53 c	Windshield washer pump
53 e	Wiper (brake winding)
53 i	Wiper motor third brush (high speed)
55	Fog lamp
56	Head lamp
56 a	Upper beam + indicator
56 b	Lower beam
56 d	Head lamp flasher contact
57	Side marker lamp
57 a	Parking lamp
58	Side marker, 1icense plate light
59	AC voltage output rectifier input
59 a	Charging armature output
59 b	Tail lamp armature output
59 c	Stop lamp armature output
61	Charge indicator
71	Horn sequence control device
71 a	To horns 1 + 2 low
71 b	To horns 1 + 2 high
75	Radio, cigar lighter
76	Speaker

Switches
Terminal	Significance
81	Break and transfer controls, input
81 a	First Output
81 b	Second Output
82	Make contact, input
82 a	Make contact, first input
82 b	Make contact, second input
82 z	Make contact, first input
82 y	Make contact, second input
83	Input
83 a	Output position 1
83 b	Output position 2

Current Relays
Terminal	Significance
84	Drive system and relay contact input
84 a	Drive system output
84 b	Relay contact, output

Terminal	Significance
85	Drive system, output (end of winding negative or ground)
86	Drive system, input start of winding
86 a	Start of winding or first winding
86 b	Winding tap or second winding
87	Relay contact for brake contact and transfer contact, input
87 a	First output
87 b	Second output
87 c	Third output
87 z	First input
87 x	Third input
88	Relay contact for make contact input
88 a	First output
88 b	Second output
88 c	Third output
88 z	First input contact
88 y	Second input
88 x	Third input

Generator and Generator Regulator
Terminal	Significance
B +	Battery positive
B -	Battery negative
D +	Dynamo positive
D -	Dynamo negative
D f	Dynamo field
J	Alternator with separate rectifier excitation winding positive
K	Excitation winding negative
M p	Center point terminal
U,V,W	Alternator three-phase AC terminals