Electrical Diagrams

Battery-Charging System Diagrams:

Battery-Charging System Components:

Locations of components

1 Battery
In the engine compartment on the right hand side

2 Alternator
On the left-hand side of the engine

4 Starter motor
1984 models: on the right-hand side of the engine (exhaust side)
1985 and 1986 models: on the left-hand side of the engine (intake side)

22 Fuse box
In the electrical distribution box in the engine compartment, on the left-hand wheel housing

47E Charging warning lamp
On the instrument panel

152B 29-pole red connector
152C 29-pole black connector
In the electrical distribution box in the engine compartment on the left-hand wheel housing. The connectors are accessible from the interior of the car.

159 Distribution terminal +15
In the electrical distribution box in the engine compartment, on the left-hand wheel housing

Operation
The charging warning lamp informs the driver of whether or not the alternator is charging.

When the ignition switch is in the drive position, a positive voltage will be supplied via fuse box 22 and the red 29-pole connector l52Bto charging warning lamp 47E in the combined instrument. The other side of the lamp is connected to alternator 2.

When the alternator is not rotating or when it is not charging the battery for any other reason, the circuit for the charging warning lamp will be earthed through terminal D+ on the alternator, and the lamp will light up.

When the alternator is charging, terminal D+ will be at the same voltage as the supply from the fuse. The same voltage will then be applied to both terminals of the warning lamp, and the lamp will therefore be extinguished.

1984 models
If fuse 13 is open or is not live on 1984 model cars, the charging warning lamp may light up when the engine is rewed up. In this case, the lamp is being supplied from the alternator and is earthed via other components in the circuit from fuse 13. The lamp can thus light up without anything being wrong with the alternator, but the field excitation may be too low, which can cause a reduction in the charging capacity.

Fault-tracing hints
1. Check the battery voltage at terminal B+ of the alternator.

2. Check the appropriate fuse (see the diagram) and check that the supply to it is live.

3 Check that the bulb in the warning lamp is intact.

4. Check the connectors, cable harnesses and the earth connections of the alternator.

5. Check that terminal D+ of the alternator is live.

6. Start the engine and measure the voltage between B+ on the alternator and earth. Also measure the voltage between D+ on the alternator and earth. The difference between these two voltages should not be greater than 0.7V.