C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

battery drain.

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Old Feb 13, 2010 | 01:47 PM
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Default battery drain.

Anyone have any ideas about this? Battery is good,almost new.If I charge it up and disconnect(I have an isolator switch) it will hold a full charge.If I connect it, by morning it's dead flat.I've pulled all the fuses and checked for a drain and can't find anything. Disconnected the alternator in case of a bad diode but no change.Something,somewhere is pulling the damn thing down but I can't seem to find it.Anyone got any ideas?
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Old Feb 13, 2010 | 03:02 PM
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There are 6 or 7 fusible links at the rear of the battery in addition to the fuses. Disconnect them and then add back one at a time. A clamp-on DC current meter is handy. What year is the vehicle?
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Old Feb 13, 2010 | 05:31 PM
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Have you inspected at night to see if any lights are stuck on?
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Old Feb 13, 2010 | 05:45 PM
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Originally Posted by staugur
Anyone have any ideas about this? Battery is good,almost new.If I charge it up and disconnect(I have an isolator switch) it will hold a full charge.If I connect it, by morning it's dead flat.I've pulled all the fuses and checked for a drain and can't find anything. Disconnected the alternator in case of a bad diode but no change.Something,somewhere is pulling the damn thing down but I can't seem to find it.Anyone got any ideas?

That freak in Vanity Light in the Visors has done me in twice.

Get an amp meter it is the tool that will provide the quickest and best we to trace a short.

TJM
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Old Feb 13, 2010 | 06:03 PM
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Thanks for the suggestions but I cracked it. Heard this relay cycling at the rear and traced it to the antenna.It should cut off when it's fully down but it wasn't doing that. Surprisingly it's not on a fused circuit. Live and learn eh!.
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Old Feb 13, 2010 | 09:38 PM
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Originally Posted by staugur
. Surprisingly it's not on a fused circuit. Live and learn eh!.
I will bet it is. I challenge you to find any circuit that is not protected from excess current.
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Old Feb 13, 2010 | 11:12 PM
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Originally Posted by staugur
Thanks for the suggestions but I cracked it. Heard this relay cycling at the rear and traced it to the antenna.It should cut off when it's fully down but it wasn't doing that. Surprisingly it's not on a fused circuit. Live and learn eh!.
GJ! finding a draw is not that easy most of the time.
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Old Feb 13, 2010 | 11:39 PM
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Originally Posted by MK 82
I challenge you to find any circuit that is not protected from excess current.
The cable/circuit from the positive terminal of the battery to the starter motor is not fused.
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Old Feb 14, 2010 | 01:27 AM
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Originally Posted by Hooked on Vettes
The cable/circuit from the positive terminal of the battery to the starter motor is not fused.
Gotcha!
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Old Feb 14, 2010 | 09:54 AM
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Originally Posted by MK 82
I will bet it is. I challenge you to find any circuit that is not protected from excess current.
I meant it's not protected by a fuse on the main fuse panel whereas the radio is.It's possible that there's a inline fuse or fused link but I have yet to find it.
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Old Feb 15, 2010 | 01:35 PM
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Originally Posted by staugur
Thanks for the suggestions but I cracked it. Heard this relay cycling at the rear and traced it to the antenna.It should cut off when it's fully down but it wasn't doing that. Surprisingly it's not on a fused circuit. Live and learn eh!.
I've got the same issue, but haven't fixed it yet. I believe the problem is in the power antenna motor and how it senses the antenna as being fully retracted. I disconnected the gray plug from the antenna relay to stop the draw, which doesn't allow the antenna to go up or down for the moment.
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