Workshop Manuals Factory service & repair Aston Martin
Aston Martin DB9 Factory Workshop Manual (Issue 2, 2005)15 · 14 Power supply
15 · General

+12 Volt Distribution

Make
Aston Martin
Model
DB9 Factory Workshop Manual
Year
Issue 2, 2005
Section
Battery System › +12 Volt Distribution
14 Power supply+12 Volt Distribution · page 1 of 2
Schematic diagram of the charging circuit showing connections between the battery, switch-battery disconnect (BDS), secondary PCM, alternator/generator, starter motor, and terminal-jump start. Key components include the Dirty Feed stud in the engine bay and earth connections via the vehicle body.

Electrical power generated at the alternator flows via two ‘T Piece’ connectors to the engine bay ‘Dirty Feed’ stud. It then flows via the Battery Disconnect Switch (BDS) to the battery positive terminal. Both the alternator and the battery are earthed via the vehicle body to complete the charging circuit.

The starter motor and the ‘jump start terminal’ are also fed directly from the charging circuit.

+12 Volt Distribution

The +12 volt supply comes from the battery to the battery disconnect switch (BDS). Assuming that this switch is not activated, 12 volt power is then available from C0046-8 on the BDS to all of the clean feed battery studs.

The following clean feeds are then live:

  • Boot fuse box clean feed
  • Under bonnet fuse box clean feed
  • CEM busbars 1, 2, 3, 4 and 5 clean feeds

12V power to all systems and components is then controlled by the CEM and the under bonnet / boot fuse boxes.

Parts & tools for this job For 2005 Aston Martin DB9

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