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  1. What the heck is this plug under the battery for?!?! Please help!

    S10 / Sonoma
    Just about done rebuilding my 4L60E for my 2000 4.3L S10. To get this transmission ready to put back in I am cleaning all of my grounds. I removed the battery and bracket it sits on to get at the grounds and I found a plug just lying on the chassis not plugged into anything. I cannot figure out...
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