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Negative batter cable connection

I have a 2007 ford focus tdci and the negative battery terminal has came disconnected completely there are 3 connections 1 to the battery 1 too the body near the battery and i cannot work out where the other goes i am assuming somewhere on the gearbox/engine but am not sure please help

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Here's how to change it out and shows the connectors: https://www.youtube.com/watch?v=UwK7zSpE...

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