Workshop Manuals Factory service & repair Alfa Romeo
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Alfa Romeo 145/146 Electrical System Diagnosis Manual, Volume 3 (1994-2001)01 · 145 electrical system diagnosis
01 · Diagnostics

FUNCTIONAL DESCRIPTION (T.SPARK version)

Make
Alfa Romeo
Model
145/146 Electrical System Diagnosis Manual, Volume 3
Year
1994–2001
Section
Starting and Charging › FUNCTIONAL DESCRIPTION (T.SPARK version)
145 electrical system diagnosisFUNCTIONAL DESCRIPTION (T.SPARK version)

FUNCTIONAL DESCRIPTION (T.SPARK version)

When the key in the ignitions switch B1 is turned to the "START" position, it energises the winding of the electromagnet (pin 50) of the starter motor A11 and supplies (pin 30) the starter motor itself with current leading directly from the battery A1 thereby cranking the engine.

When the engine is running, the direct current generated by the alternator A3 (pin B+) is sent to recharge the battery A1 via the starter motor A11. All the lines for supplying the various electric systems of the car branch from the terminal box G56 connected to the + terminal of the battery A1 (see "Supply"), in particular the supply for the ignition switch B1 via fuse G384 (50A)

When the alternator is not turning and therefore not charging the battery, an earth signal is sent from pin D+ to the instrument cluster C10 to turn on the corresponding warning light; once the engine has been started this signal becomes 12 V and the warning light goes off.

COMPONENTS AND CONNECTORS (T.SPARK version)

Battery A1 Alternator, with built-in voltage regulator A3
16RED • A11 1GRY-YEL • G308 D+
16RED • G56 16BLK • G318 10BLK • G53b B+
16RED • A11 16RED • A11
16RED • G56 16BLK • G318 10BLK • G53b
Starter motor A11 Ignition switch B1 B
16RED • A3 2.5RED • G56 B
16RED • A1 2.5RED-BLK • G5 A
2.5RSS-NRO • G5 2.5RSS-NRO • G5
30 50
Wiring diagram for T.SPARK vehicle electrical components and connectors

Parts & tools for this job For 1994 Alfa Romeo 145/146

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