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bat light coming on

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Old Dec 5, 2006 | 10:28 AM
  #1  
mailliwten's Avatar
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Default bat light coming on

while driving my 78 after a while bat light comes on..... Day, night, rain, no rain, hot, cold as drive continues light gets brighter; amp meter dips slowly to the negative; but never in the red. next day go for ride no light at start of ride; then all of a sudden like magic the light begins to glow til its bright red again.......any ideas?????
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Old Dec 5, 2006 | 10:31 AM
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Have your Battery and Alternator checked... might be a diode in the alternator, sometimes they degrade as they get warm and you get less charge from the ALT.
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Old Dec 5, 2006 | 10:33 AM
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Originally Posted by GruntyPants
Have your Battery and Alternator checked... might be a diode in the alternator, sometimes they degrade as they get warm and you get less charge from the ALT.
Advance Auto and Auto Zone will due it for free.
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Old Dec 5, 2006 | 12:08 PM
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Originally Posted by Jud Chapin
Advance Auto and Auto Zone will due it for free.

Oreilly too. They will check everything while they are in the car and under a load. for the best testing.
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Old Dec 5, 2006 | 12:45 PM
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I had the same problem. It was my diodes. Mark.
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Old Dec 5, 2006 | 01:23 PM
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Time for a new alternator! My battery light came on, too, until I replaced that sob.
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Old Dec 5, 2006 | 01:27 PM
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From: Columbia Missouri
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Originally Posted by Kalway
Time for a new alternator! My battery light came on, too, until I replaced that sob.

Yep...new alt is in the cards. Do yourself a favor though, and use this chance to upgrade to a CS130 or CS144. Both will give you another 60 - 100 amps.
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