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post #1 of 10 (permalink) Old 02-20-2013, 02:35 AM Thread Starter
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08 battery goes dead over night

Over the last summer the battery in the Armada would randomly go dead over night. We passed this off as a door being left ajar or an interior light left on. Now that it is really cold, the battery goes dead every night. It sometimes will go dead in a matter of hours as well. Other times it will start right up. Is it a combination of a lousy battery and the cold? So what i did was hook up a fully charged battery that was removed from another truck with a set of booster cables for 3 days. When I checked this morning, the battery was not stone dead, but only had 9.8 volts in it. I think I may have a draw on the system somewhere. But where do i start looking?

Also, the fan is stuck on high. Even if you turn the fan switch down, the fan stays wide open. From what I have read on here, I need a new VBC, Could this be my no start culprit as well?

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post #2 of 10 (permalink) Old 02-20-2013, 09:22 AM
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Check for current draw at the battery. A bad diode in the alternator will cause current draw, and discharge the battery.

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post #3 of 10 (permalink) Old 02-20-2013, 09:35 AM
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Quote:
Originally Posted by drauden View Post
Check for current draw at the battery. A bad diode in the alternator will cause current draw, and discharge the battery.
Will this trigger a warning light, or a change in the Alternator gauge? As I posted in an earlier thread, my truck eats batteries; the longest I've gotten out of a single battery is 3 years.

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post #4 of 10 (permalink) Old 02-20-2013, 10:19 AM
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08 battery goes dead over night

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Originally Posted by Campfamily View Post
Will this trigger a warning light, or a change in the Alternator gauge? As I posted in an earlier thread, my truck eats batteries; the longest I've gotten out of a single battery is 3 years.

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post #5 of 10 (permalink) Old 02-20-2013, 11:20 AM
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Yeah you just need a new battery. Get it tested first though just to be sure.


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post #6 of 10 (permalink) Old 02-20-2013, 11:49 AM
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Also don't forget Driver Side Cig Lighter is ALWAYS Hot so anything plugged into it drains the battery dead.




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post #7 of 10 (permalink) Old 11-27-2013, 09:55 PM
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Factory battery clamps! They have different expansion rates than lead or high quality ones. I swapped out the factory clamps for quality ones and 90% of the problem went away. If you watch your charge gauge, it should stay at about 14 volts. But there is a temperature/resistence sensor in the battery lines. If you hear a click and the charging needle drops instantly to zero charge, put in a grounding kit, or replace the fusable link, or make sure your connections on the fuse at the positive terminal clamp are clean and complete. Very common problem with Armadas, which have temp sensitive charging systems.
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post #8 of 10 (permalink) Old 11-28-2013, 06:55 AM
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I have noticed also that the batteries these days do not last near as long as they did years ago. I have averaged about 2.5years life over the last 3 batteries and they all went dead over night.
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post #9 of 10 (permalink) Old 11-28-2013, 09:54 AM
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Probably just a bad battery. The alternator has a full-wave bridge rectifier in it, so there is always a few microamps of reverse leakage current through the schottky diodes, but this is nothing compared to other vampire loads.

It would take two bad diodes in the bridge to cause significant current, but then since schottky diodes don't tend to be graceful in reverse breakdown (they just fail short), they would basically just blow up instantly and the alternator would fail altogether.

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post #10 of 10 (permalink) Old 11-28-2013, 12:36 PM
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Yeah but this thread was from 8 months ago.

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