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Next time, please search our wiki section. It's in Dutch, maybe you need to translate to your native language by Bing or Google Translate. There you can find many items like yours.
Your part is located in the top right of the image called "Spanningregelaar 12V 60W". Wiring is from left to right: Blue/Blue (D+ from ignition), Yellow/Yellow (12volts AC), White (12volts DC) and Brown/Brown (Ground). On the terminals of the "Silver thing" which are labeled you can connect the wiring to