Alternator Wiring Harness. Porsche 911 1987-89

Alternator Wiring Harness.
Restore reliable power delivery and charging performance with this Porsche 911 Alternator Wiring Harness.
This harness connects the alternator, ignition system, and engine electrical components in your Porsche 911, ensuring accurate current flow and dependable operation.
Whether you’re performing a restoration or replacing aged wiring, this harness guarantees a plug-and-play fit and restores the car’s electrical integrity.

Fits:

• Porsche 911 1987-1989 3.2L G50

Diagram Ref No 1

What This Product Does:

• Transfers the charging current produced by the alternator to the battery and electrical system.
• Keeps the battery charged while the engine runs.
• Carries voltage and signal lines for the alternator field and warning light circuits.
• Ensures proper communication between the alternator, voltage regulator, and ignition system.
• Integrates wiring for the ignition coil, temperature sensors, and other engine-side electrical parts.
• Ensures reliable power and data flow to these systems for smooth engine operation.
• Uses heat-resistant insulation, sleeves, and grommets to protect wires from engine-bay heat, oil, and vibration.
  
• Prevents short circuits and voltage drops caused by aging or damaged wires.

Common Issues / Symptoms Of A Bad Harness:

• The alternator may fail to charge the battery (no output or intermittent output)
  
• Ignition problems, misfires, poor engine running because sensors or ignition wiring is compromised
  
• Blown fuses or electrical faults in the engine bay
• Loose or corroded connectors, brittle insulation, broken wires
  
• Intermittent electrical gremlins — sometimes works, sometimes doesn’t

Why Replacement Matters:

• Stable voltage to charging and ignition systems
• Elimination of intermittent electrical faults
• Safer, more reliable engine operation

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160701602

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