Need help with Iginition switch/starter issues

On the starter relay... most common color of the 2 small signal wires are yellow and brown.
Yellow is 12 volt start signal from ignition switch. A volt meter or simple test light there should show 12 volts every time the switch is turned to the start position.
Brown is the ground signal or path supplied by the neutral safety switch. An ohm meter should should very near zero resistance. If all of that checks OK the relay should click closed and send 12 volts on the larger wire going to the starter with every turn of the switch to start position. Hope this helps