hi, there was only 2 wires. a larger 1 that i have put to the b+ and the smaller to the dash light by changing to a spade connector. as for 3 little prongs....?! they were both just washer connectors that got bolted on.

my battery dash bulb doesnt even work anyway... so cud i put both wires to the b+ and see if that works? cheers

o and the little box isnt required then ok cheers mate