E5010 Ignition and recharging (Selespeed)

Description

The ignition and recharging circuit comprises a battery, starter motor and alternator.

The battery (12V) is low maintenance lead type.

The starter motor consists of a direct current motor supplied by the battery and an excitation solenoid.

When the ignition key is turned to the extreme position (AVV), the starter motor windings are supplied, producing electro-magnetic forces which rotate the motor pinion. At the same time, the solenoid is energized and operates the mechanism for engaging the pinion in the flywheel ring, thus turning the crankshaft.

On this version with automatic transmission, the starter motor enablement is supplied by the Selespeed control unit. ( Wiring diagram E7050 AUTOMATIC TRANSMISSION ).

The alternator recharges the battery during normal engine rotation.

The alternator shaft (rotor) is turned by the crankshaft by means of a belt. When supplied with an excitation current, the rotor sets up a magnetic field that induces an alternating current in the fixed coil (stator).

A diode rectifying bridge located on the back of the alternator transforms the alternating current into a direct current, which is sent to recharge the battery.

A voltage regulator, also built into the alternator, maintains a constant voltage supply (about 14V) throughout the load and engine speed ranges.

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 maxifuse IGN of B99.

This supply is only present if there is a safety signal - from pin 42 of connector A of M54 - which energizes the starting enablement relay J05, which thus supplies power to pin 50 of the starter motor A20; pin 76 of connector B of M54 receives the starting request signal.

Pin 30 of A20, the actual starter motor, receives the voltage coming directly from the battery A1.

The direct current generated by alternator A10 (pin B+) is directed to battery A1, passing through motor A20. When the alternator is not turning and therefore not recharging the battery, an earth signal is sent from pin D+ to the rev counter module E15, pin 7 of connector B.

Module E15 receives a supply controlled by the ignition (INT) at pin 15 of connector A from the line protected by fuse F4 of the additional fuse box B98B: when this signal arrives, the "recharging" warning light comes on.

When the engine has been started up this signal becomes 12 V and the warning light goes out.

Wiring diagram

Components

Component location