ok thats an easy one
add upp the wattage of the bulbs that the wire /switch is feeding and
divide by 12 that will give you the amperage drawn for eg..
2 x55w headlamp bulbs and 2 x5w rears and 1x3w no plate is total 123watts
so 123w divided by 12 is a tiny bit over 10 amps
so you will need cable and switching to carry 10 amps comfortably
probably you will find 17 amp cable is an industry standard ( blue lucas terminals ) and a 15 amp fuse would be adequate for this circuit..
hope that helps
cheers les g
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