E30 series BMW 3

since 1983-1994 of release

Repair and car operation

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engine
   + 3.1.2. Specifications
   + 3.2. Dismantle and major maintenance of the engine
   - 3.3. Engine electric equipment
      3.3.2. Specifications
      3.3.3. The battery - engine start-up in emergency situations
      3.3.4. Removal and battery installation
      3.3.5. Power cables
      + 3.3.6. Ignition system
      + 3.3.7. System of a charge of the battery
      + 3.3.8. System of start-up of the engine
      3.3.9. Malfunctions of the generator
      3.3.10. Main malfunctions of electric equipment
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Good advice


3.3.5. Power cables


1. Periodically check cables on all length, damage, cracking or a burn-out of isolation of cables, and also corrosion are not allowed. Unreliable connection of the battery can cause refusals at engine start-up, and also deteriorations of operational qualities of the engine.
2. Check a condition of connections of poles with plugs, existence on them of corrosion, cracks and weakening of fastening of wires. Existence of a white being shelled raid under isolation in a place of the plug testifies to corrosion of conductors of a cable and need of its replacement. Check existence of corrosion and deformations on plugs and a condition of bolts of fastening.


1. Disconnect from the battery old cables, track laying of cables on their length and find places of their fastening to a starter and to weight, disconnect cables from the traction relay of a starter and weight. Remember a route of laying of a cable to lay a new cable to the place of the replaced.
2. If cables are replaced new, getting new cables, grasp with itself old. New cables should correspond in accuracy to the replaced. The cable of a positive pole is easy for distinguishing from a cable negative – isolation of a cable of a positive pole of usually red color, these cables have bigger cross-section section, the storage plug differs in big diameter. Isolation of a cable of connection with mass of black color, cross-section section and diameter of the plug is less, than at a cable of a positive pole.
3. Clear carvings of fastening of cables of the battery on the traction relay of a starter and on a body, remove corrosion traces.
4. Attach a cable to the traction relay of a starter or to weight, reliably tighten nuts and fastening bolts.
5. Before accession to the battery of a new cable be convinced that the cable has sufficient length, and will be established without a tension.