Ignition Light

Hi, anyone know how I can wire up an ignition light after ripping out all the unwanted wiring when building a autograss racer. I seen some thread about linking wires if you've got a 4 wire block connector.

My alternator is a Bosch with 1 thin black and 1 thicker black wire going to it, no other wires. I've tried wiring up a lamp from the small black wire but nothing happened.
 
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