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Message: <blockquote data-quote="rubes72" data-source="post: 180560" data-attributes="member: 2906">Hey Jarance,If there is oxidised material on the contact, that means there is a leakage somewhere on your electrical. when you bolt elctrical cables, make sure it is tight, loose connectors may cause sparking, and yes the contact points has to be absolutely clean, with no residue.On the cable size, you can use anything above 16mm, which has a rating of 150 - 200 amps (has to be of DC spec which has lower resistance). This is especially if you want to make direct contact with your ground battery. It has to be heat resistant  and halun free. You can install a copper bus bar if you like, but I chose gold plated lugs instead.</blockquote>