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Corvette
C7 Forum
No electrical power but battery tests OK
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<blockquote data-quote="cdnrx1" data-source="post: 314972" data-attributes="member: 2880"><p>Hi Peter:</p><p></p><p>Sorry to hear that you are having electrical issues with your GS. A little more information may help to determine the possible cause of the problem.</p><p></p><p>1 - Is this the original battery that came with the car? If so, this would be my first choice as to what's causing the problem. The OEM battery, when used under normal conditions and properly maintained, is good for approximately 5 to 7 years of service. Your car appears to fall within that usage period and may have developed an intermittent internal fault(s) that can't be easily detected by basic shop testers.</p><p></p><p>2 - If it's a replacement battery, when was it installed, is it a conventional sealed lead acid or AGM battery? What make / model is it?</p><p></p><p>3 - Are you getting any warning info displayed on the DIC? If so, do you have a code reader or can you get your battery supplier to read them for you and provide the results?</p><p></p><p>If your running the original battery, the first thing I would do is replace it. It's the most likely culprit. If it's a replacement I'd start with a proper load test using a professional battery tester / analyser. I'm not saying that your battery supplier's equipment is not up to par but a correct diagnosis requires the right equipment. You mentioned the the CCA test was done on the battery when it was out of the car and the preferred method would be to run the test with the battery installed in the car using the vehicle's starter. Same for checking alternator output.</p><p></p><p>As to the BCM being the cause of the problem, it could well be. Leaving the doors and hatch open for an extended period should not cause the problem that you've experience. The BCM should cut the electrical draw after 8 to 10 minutes in order to protect the battery. If that's not happening then the BCM could be the problem or there may be an unrelated parasitic draw taking power directly from the battery.</p><p></p><p>Let us know the answers to the above questions, maybe we can provide some additional information.</p><p></p><p>Best regards</p><p>Ross</p></blockquote><p></p>
[QUOTE="cdnrx1, post: 314972, member: 2880"] Hi Peter: Sorry to hear that you are having electrical issues with your GS. A little more information may help to determine the possible cause of the problem. 1 - Is this the original battery that came with the car? If so, this would be my first choice as to what's causing the problem. The OEM battery, when used under normal conditions and properly maintained, is good for approximately 5 to 7 years of service. Your car appears to fall within that usage period and may have developed an intermittent internal fault(s) that can't be easily detected by basic shop testers. 2 - If it's a replacement battery, when was it installed, is it a conventional sealed lead acid or AGM battery? What make / model is it? 3 - Are you getting any warning info displayed on the DIC? If so, do you have a code reader or can you get your battery supplier to read them for you and provide the results? If your running the original battery, the first thing I would do is replace it. It's the most likely culprit. If it's a replacement I'd start with a proper load test using a professional battery tester / analyser. I'm not saying that your battery supplier's equipment is not up to par but a correct diagnosis requires the right equipment. You mentioned the the CCA test was done on the battery when it was out of the car and the preferred method would be to run the test with the battery installed in the car using the vehicle's starter. Same for checking alternator output. As to the BCM being the cause of the problem, it could well be. Leaving the doors and hatch open for an extended period should not cause the problem that you've experience. The BCM should cut the electrical draw after 8 to 10 minutes in order to protect the battery. If that's not happening then the BCM could be the problem or there may be an unrelated parasitic draw taking power directly from the battery. Let us know the answers to the above questions, maybe we can provide some additional information. Best regards Ross [/QUOTE]
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Corvette
C7 Forum
No electrical power but battery tests OK
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