2006 Jaguar X-Type Q&A

2006 Jaguar X-Type Question: removed negetive cable from battery post to clean corrosion.

Upon removal of negetive battery cable to clean post and clamp, a small connector appeared out of nowhere. It sits at the end two green wires and has a small green horeshoe shape on the connection face. I've looked for a connection site but I am stumped. What is it and where the heck does it connect to something? -
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