BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 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. Useful tips
   14.2. The changed numbers
   14.3. Purchase of the old car or mysterious set of figures and letters
   14.4. Durability of the car
   14.5. About parallelism of bridges of the car and trailer
   14.6. Preparation of the car for winter
   14.7. Rule 35
   14.8. Choice of the used car
   14.9. Engine oils
   14:10. What needs to be known, changing oil
   14:11. Emergence in deposit oil
   14:12. Whether it is possible to mix import oils?
   14:13. "Eats" much, but quietly goes
   14:14. It is rather live, than is dead …
   14:15. It is not got - useful tips
   14:16. Visit to car service
   14:17. A gear belt for the gas distribution mechanism drive
   14:18. Wear of pistons
   14:19. Valves
   14:20. Bearings of engines
   14:21. Pollution of the engine
   14:22. As the conditioner works and what to do if it failed
   14:23. Conditioner: not only "pluses", but also "minuses"
   14:24. Rules of service of the conditioner
   14:25. Antifreeze you should not disturb with antifreeze …
   14:26. What should be known upon purchase of the air filter
   14:27. Engine overheat
   14:28. What should be known to the owner of the car with the injector engine
   14:29. Accumulator
   14:30. Possible malfunctions of the rechargeable battery
   14:31. What to do with the failed generator
   14:32. The belt is guilty, and we blame the generator
   14:33. Catalyst
   14:34. Rub in one - or how to save the catalyst
   14:35. Probuksovochka
   14:36. Features of operation of the brake system
   14:37. Malfunctions of the brake system
   14:38. Brake fluids
   14:39. ABS: natural choice
   14:40. Rims
   14:41. We update rims
   14:42. Scheme of marking of a car tire
   14:43. Metal corrosion
   14:44. Automake-up
   14:45. What creaks?
   14:46. Hatch
   14:47. Safety cushion: troubles or pleasures?
   14:48. We fit well?
   14:49. Anticreeping "immunodeficiency"
   14:50. Why headlights grow dull
   14:51. Galogenka
   14:52. About the correct adjustment of headlights
   14:53. Electric motor
   14:54. From change of the places "composed" nothing changes?


14:51. Galogenka


The main reason for bystry failure of halogen lamps in cars – the big current proceeding through a lamp at the time of inclusion as resistance of its thread in a cold state is many times less, than in heated.

In this regard it is recommended to limit starting current by means of the additional resistor which is switched on consistently with threads of an incandescence of halogen lamps. After inclusion of a lamp it is resistance it is short-circuited by means of the relay of tension established parallel to a lamp.

Lack of such devices is need of use of one or two electromagnetic relays, details not enough reliable, especially in the conditions of the car experiencing vibration. Besides, at the time of inclusion after all spasmodic increase of current, though up to the smaller size takes place, than at usual schemes of inclusion of lamps.

Experts developed the contactless device which is not demanding use of the relay and providing smooth increase of current in a lamp. The device consists of the additional R1 resistor, two VD1 and VD2 diodes and the electrolytic condenser C.

At inclusion of thread of passing beam on a clip 1 positive potential moves. At the same time the VD1 diode connects the condenser C parallel to lamp thread, and is consecutive with it – the R1 resistor.

At inclusion of thread of driving beam positive potential moves on a clip 2, and the condenser C is connected parallel to thread of driving beam via the VD2 diode.

At such scheme of connection tension on lamps of EL1 and EL2 increases smoothly.

Resistance of cold threads of usual automobile lamps of near and far light approximately 10 times less their resistance in a heated state. The constant of time of heating of thread of a lamp makes 0,0014–0,003 pages.

In the course of inclusion of a lamp it is necessary for an exception of unacceptably big current that the speed of increase in resistance of thread of a lamp was more than the speed of increase in tension. It is reached by installation of electrolytic condensers with a capacity of 4000-6000 мкФ, with a rated voltage of 25 V.

If to take this advice, then along with increase in service life of lamps also accumulator life because of decrease in starting current and increase in smoothness of its increase will be prolonged.