Description of operation

DESCRIPTION OF OPERATION

When the ignition key for the switch H1 is turned to the extreme position (AVV), the solenoid winding (pin 50) of the starter motor A20 is supplied. This supply comes from the battery via the line of 40A maxifuse IGN of B5. Pin 30 of A20, the actual starter motor, receives the voltage coming directly from the battery A1.

The direct current generated by the alternator A10 (pin B+) is sent to the battery A1 through motor A20.

When the alternator is not turning, i.e. not charging the battery, an earth signal is sent from pin D+ to instrument panel E50 - pin 2 of connector B.

The instrument E50 is supplied with the ignition switched on (INT) at pin 18 of connector A from the line protected by fuse F22 of the junction unit B1.

When the instrument panel is on, the 'recharging' warning light is lit up because the signal available from pin D- of the alternator is an earth. When the vehicle has been started up, when the alternator is recharging the battery correctly, the 'recharging' warning light goes out because the voltage at pin D+ of the alternator A10 is +12V; in effect, as there is no variation in voltage between pin 2 of connector B and pin 18 of connector A the internal diode does not allow the current to pass.

COMPONENTS