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Took my 2004 Honda Civic hybrid battery out to test it because my battery light was on and so is my ima light. Took it apart and noticed this red wire was sniped. Does anyone have a clue what this wire is used for and if so is this my issue. It text fine and seems like it’s a working battery

 
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connect it. pretty obvious where it should be going
read around about how to avoid shocks from battery first, though

 
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That looks like a vent tube

 
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maybe not, it is connected on the other end

 
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of course, it could just short and cause a fire
not an expert on hybrids by any means

 
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here, from googling 2004 civic hybrid battery and selecting "images"

 
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I thought it may have been some hacked wiring someone added but the way it routes seems to be from the factory.

 
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oh, you still having issues to see the pictures? The one i posted shows the same wiring, but connected

 
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For whatever reason I cannot see your pictures. However, I could tell you posted one and looked on my phone. The hacked wiring though was before I saw your picture.

 
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It goes to that terminal. No idea what the function is.

 
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I've read elsewhere that cutting this wire was one of the "fixes" Honda did when the first gen batteries started dropping like flies and the high failure rates were going to cause regulatory issues in states like CA.