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940 electrical quirk 900

Weird thing happened today- driving home from work and all of a sudden I get 5 instrumentation warning lights go on- Brake failure,parking brake,service,
bulb failure,battery(gen. not charging). I didn't know what was amiss at that point but the engine was still running so I drove the last few miles home. When I got home I popped the hood and just found the Alt. belt was broke. Question is, why did all those other lights come on, not just the Battery/alt. not charging light?








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    940 electrical quirk....(not really) 900

    "Question is, why did all those other lights come on, not just the Battery/alt. not charging light?"

    Because that's the normal state of those lights when the key is ON (position II) and the alternator is not turning.

    That's why Key Position II is sometimes called the "bulb test" position.

    --
    Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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    940 electrical quirk 900

    Dear emaycom,

    Hope you're well. On the couple of occasions when an alternator belt failed on my cars, all - not just some - of the warning lights came on. I'd guess Volvo did this, to grab the operator's attention. It seems to work.

    Some will ignore a single warning light, especially if the car's performance seems fine. That's the case here: your car ran smoothly "on battery only", after the broken belt stopped the alternator from re-charging the battery.

    Depending on the battery's condition, a car may run on battery only for an hour or so. When the battery gives its last, the car stops. Recharging a fully-discharged battery is pretty time consuming. If the battery is weak, the full discharge may "kill" the battery: it won't recharge.

    I doubt the brief period, when the battery was not re-charged, did any damage. Replace the alternator belt and all should be well. Check the other drive belts: it is best to replace drive belts in sets.

    If the belts have small cracks in them, they don't owe you a nickle. It is better to replace them in your garage/driveway, than road-side.

    Hope this helps.

    Yours faithfully,

    Spook










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      940 electrical quirk 900

      Thanks guys. I appreciate the detailed explanation, Spook. I did replace the belt and battery didn't seem to suffer from the brief time IT was running the car. Have a great holiday.







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