coin door wiring

wildwest3163

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just making sure I have this figured right. the wire on the jamma harness marked coin lockout runs to the switch on the coin mech, other switch wire is one of the harness grounds. a 12v line from the power supply to the light, do I need to run a ground back to the ps, or just earth ground?
 
In general, earth ground shouldn't be part of your active circuits. I would recommend using the ground on the PS for any circuit using the 12V.
 
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