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Battery draw testing

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Old Dec 10, 2021 | 06:07 PM
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Default Battery draw testing

Still chasing down electrical gremlins. My question is: would it have an affect on mA draw and voltage battery draw if the sun visors are unplugged? I am getting a fluctuation in battery voltage and hear the relays from the footwell board clicking on and off producing a battery voltage fluctuation that does not stop. Is the BCM looking for the HomeLink or the vanity mirrors? The fluctuation is from 7 amps to 44 mA and 12.74 to 12.51 on voltage. Just trying to rule things out. Thanks
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Old Dec 11, 2021 | 08:26 AM
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Originally Posted by cmonkey713
Still chasing down electrical gremlins. My question is: would it have an affect on mA draw and voltage battery draw if the sun visors are unplugged? I am getting a fluctuation in battery voltage and hear the relays from the footwell board clicking on and off producing a battery voltage fluctuation that does not stop. Is the BCM looking for the HomeLink or the vanity mirrors? The fluctuation is from 7 amps to 44 mA and 12.74 to 12.51 on voltage. Just trying to rule things out. Thanks
The visors unplugged should not have any affect on the draw. 7 amps is a huge draw. Have you disconnected the alternator or pull that fuse just to see if it goes away. It could be a bad diode in the alternator. Good Luck in your troubleshooting.
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Old Dec 11, 2021 | 09:03 AM
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Originally Posted by 4SUMERZ
The visors unplugged should not have any affect on the draw. 7 amps is a huge draw. Have you disconnected the alternator or pull that fuse just to see if it goes away. It could be a bad diode in the alternator. Good Luck in your troubleshooting.
Good idea, I will unplug the alternator and see what we get then. On a side note, threads like this are a great research tool for those who may have similar issues in the future. I will post up when we have the issue resolved the details on what the problem was.
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Old Dec 11, 2021 | 09:43 AM
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Originally Posted by cmonkey713
Good idea, I will unplug the alternator and see what we get then. On a side note, threads like this are a great research tool for those who may have similar issues in the future. I will post up when we have the issue resolved the details on what the problem was.
It sure is. One member has a draw, which goes away when he pulls the BATT 5 fuse, but when he checks individual circuits of the source, he can't seem to pin it down. Most time in that circuit, it's the Onstar that is the culprit, onstar sends signals to try to connect.

Good Luck, hope you can find the cause.
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