Workshop Manuals Factory service & repair Alfa Romeo
01 145 electrical system diagnosis02 146 electrical system diagnosis03 ABS, Alfa Romeo Code and engine management
Alfa Romeo 145/146 Electrical System Diagnosis Manual, Volume 3 (1994-2001)02 · 146 electrical system diagnosis
02 · Diagnostics

FUNCTIONAL DESCRIPTION (Boxer versions)

Make
Alfa Romeo
Model
145/146 Electrical System Diagnosis Manual, Volume 3
Year
1994–2001
Section
Power Supply › FUNCTIONAL DESCRIPTION (Boxer versions)
146 electrical system diagnosisFUNCTIONAL DESCRIPTION (Boxer versions)

FUNCTIONAL DESCRIPTION (Boxer versions)

The supply leading from the battery A1 is divided among various lines in the branch terminal board G56, from where numerous cables lead, directly supplying some systems (protected by special "wander" fuses) and the fusebox G1; inside the fusebox the power is distributed to the various circuits, protected by the corresponding fuses (see the "Fusebox" section).

The battery recharging line leads from the alternator A3, through the starter motor A11.

The ignition switch B1 is also supplied via the terminal board G56 at pin B of connector B.

The line that leaves pin A of connector B corresponds to the "STARTING" position and it supplies the starter motor A11, (only for certain cars without ALFA ROMEO CODE but with anti-theft system, through the antitheft control uni N45 and stating consent relay I10)

The line leaving pin 3 of connector A - "RUN" position - via the fusebox G1, supplies the "key-operated" circuits, which are however disengaged in the "STARTING" position.

The lines that leave pin 1 of connector A and pin C of connector B supply, either directly or through the fusebox G1, the "key-operated" circuits which also remain engaged in the "STARTING" position.

Lastly, the line that leaves pin 2 of connector A corresponds to the "PARKING" position and supplies the sidelights circuit inside the fusebox G1.

With the adoption of a special high capacity fuse (150A) G393 all the supplies are protected, with the exception of the starter motor cable (battery - motor) and the recharging cable (motor - alternator): these cables are protected by a supplementary "armored" sheath.

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

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