Key:  VW Type 3 1600 from Aug 1966, chassis 317 000 001 ; US model.

A - Battery
B - Starter
C - Generator
D - Regulator
E - Turn signal switch with ignition/starter lock
F - Lighting switch
F1 - Windshield wiper switch
H1 - Horn half ring
H2 - Horn
J - Hand dimmer relay
J1 - Turn signal emergency light relay 
J2 - Hand dimmer switch
J3 - Brake light switch
J4 - Oil pressure switch
J5 - Fuel gauge sender unit
J6 - Emergency light switch
J7 - Back up light switch
K1 - High beam warning lamp
K2 - Generator warning lamp
K3 - Turn signal warning lamp
K4 - Oil pressure warning lamp
K5 - Parking light warning lamp
K6 - Speedometer light
K7 - Fuel gauge light
K8 - Clock light
L1 - Sealed beam insert, left
L2 - Sealed beam insert, right
M1 - Parking light and turn signal light, left
M2 - Parking light and turn signal light, right
N - Distributor
O - Ignition coil
O1 - Automatic choke, left
O2 - Automatic choke, right
O3 - Electra-magnetic pilot jet, left
O4 - Electra-magnetic pilot jet, right
P1 - Spark plug connector, No. 1 cylinder
P2 - Spark plug connector, No. 2 cylinder 
P3 - Spark plug connector, No. 3 cylinder 
P4 - Spark plug connector, No. 4 cylinder
Q1 - Spark plug for No. 1 cylinder 
Q2 - Spark plug for No. 2 cylinder
Q3 - Spark plug for No. 3 cylinder
Q4 - Spark plug for No. 4 cylinder
R1 - Radio
R2 - Aerial connection
S - Fuse box
S1 - Back up light fuse
T1 - Cable connector, single
T2 - Cable connector, double
V1 - Door switch, left
V2 - Door switch, right
V3 - Luggage compartment light switch
W - Windshield wiper motor
X1 - Turn signal lights
X2 - Tail lights
X3 - Brake lights
Y - Interior light
Y1 - Luggage comportment light
Z - License plate light
Z1 - Back up light, left
Z2 - Back up light, right

Earth connections:
1 - Battery to frame ground strap
2 - Horn half ring to steering coupling ground connection
3 - Transmission to frame ground connection
4 - Windshield wiper motor to body ground strap
5 - Front axle to frame ground strap

Black dotted lines = Optional extras
1.5; 0.5 etc.: Cable cross section