How to Use Diagrams

HOW TO READ CURRENT FLOW DIAGRAMS

In previous wiring diagrams electrical components were shown in the approximate position as you would find them on the car. However, to show the electrical connections between each component in the diagram became more and more difficult as the number of components increased. The result was that it was hard to trace electrical circuits.

To make reading wiring diagrams easier, we revised them completely. The result of intensive studies is a new diagram called "current flow diagram".

Current flow diagrams are laid out by placing circuits of related components one next to the other. The base of each circuit always starts with ground. The location of components on this diagram is no longer related to where the components would be in the car. The layout of the circuits, however, is such that each can be followed much easier to help in troubleshooting of electrical faults.

Looking at a current flow diagram you will find a yellow base line. The numbers in the yellow base line characterize the current tracks in the diagram and are to locate each component that is listed in the legend.

The colored lines in the diagram represent wires in the car, the colors correspond with the actual colors of the wires, The small numbers in the wiring runs indicate the wiring gauge in mm2. The thin black lines are not actual wires but internal connections, such as the ground connection of a lamp housing. The base line for ground is the thin black line directly on top of the yellow base line.

Interrupted wires or connections end in a yellow square. Continuation of this interrupted circuit can be found in the current track using the number in the square.

Each component in the diagram is identified with a letter, sometimes with a letter and a number. Component definition can be found in the legend.

Most connectors or terminals are numbered. These numbers correspond with the numbers that are right next to most connectors on electrical componerts such as switches and relays. This numbering system is used on most European cars. Listed below are the most commonly used terminals and their location.

Terminal No. Location

B+ - on coil, input from ignition switch
D+ - on relay and generator
DF - on relay and generator
1 - on coil, output to primary distributor lead
4 - on coil, high tension output and on distributor high tension lead
15 - on coil, imput from ignition switch
30 - on starter solenoid, input from battery, ignition starter switch, light switch, dimmer relay, and twin horn relay
31 - ground
31 b - windshield wiper switch and motor
49 - on turn signal bulbs
50 - on both terminals of starter solenoid - ignition starter switch
54 - on stoplight bulbs, steering ignition switch and windshield wiper switch
54 d - windshield wiper switch and motor
56 - light switch and dimmer relay
56 a - dimmer relay, headlight low beam
56 b - headlight high beam
58 - on taillight bulbs, light switch and front parking lights
58 b - light switch
85, 86, 87 - relay