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Thread: Astra Charging Details - Mk3 1998

  
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    Astra Charging Details - Mk3 1998

    Could I please ask for some in depth details?I know that the two main Alternator connectors go to the battery.According to haynes the 3rd wire goes to the charge lamp and then to a relay etc. I believe it is now normal to have a resistor in parallel with the bulb to ensure the charging circuit works even if the bulb blows. But I cannot see one in haynes.My bulb is not lighting but the charger works (14.5V) only when revved up. Battery and belt fine.At the alternator end can I do some thing like insert a resistor to get it working temporarily ?Thanks

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    Silly question, is the bulb blown ?

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    No, fair question. Thanks for taking the time. It is a nightmare getting under the dash so yet to check. Slow progress. Thought of changing the belt anyway so figured do something at the alternator end. If GM had left out this resistor then it may be a good idea to put one at the alternator end?? Should the third alternator connector go to B+ or B- ?? Getting a good knowledge at this time might proove useful. Heard that frequently people change alternators and battery and still charging system fails. Can alternators give 14.5 volts (only when revved) and still fail ??

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    There is no resistor it's just a 5 watt bulb.

    If the regulator fails and overcharges, the dash bulb blows, so next time the car starts the alternator won't charge, or not until above 3000 rpm or so, where the residual magnetism in the alternator is enough to get it charging.
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    Thanks guys. Finally got to the bulb and replaced it. This forum was most useful and haynes not as good as it used to be. All fine now. I am puzzled as to why an important part of a car is dependant on an unreliable filament bulb to work. When the weather gets better I would like to insert something at the alternator end so that there is current at the field all the time. I would appreciate any guidance.

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    Fit a bulb.

    We've done this on SPL competition cars running twin alternator systems. It's the easiest way to get it all working.
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    A 5W bulb that's only taking more than 5W when the alternator is goosed, will last an awful long time.
    It's only taking the 5W when the ignition is on but no engine running.
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