How To Wire In A Jamma Harness - Arcade Controls I try to use the color that fits into my overall color scheme when making harnesses, and in this case, for JAMMA, I use yellow 18ga for -5 volts. The remainder of the wires used as I/O are 20 guage. The first thing you need to do with your harness is bundle it. Videos of jamma harness wiring guide Click to view on YouTube20:29Arcade Jamma Harness Explanation 2018 Edition1 viewsYouTube · 8/25/2018Click to view on YouTube4:51The JAMMA Standard5 viewsYouTube · 1/14/2016Click to view on YouTube16:53How to wire the jamma 619 in 1 pcb ( Ultracabs Arcades )64K viewsYouTube · 7/10/2015See more videos of jamma harness wiring guide The Arcade Jamma Extension Harness Explanation & Correct Jan 17, 2014Need to add some wiring to your jamma harness? If so, then this video is for you. These sites are great for finding out about certain people you may jamma wiring harness | eBay www›Search›jamma wiring harnessJAMMA Wiring Harness Multicade 60 in 1 Arcade Game Cabinet Wire Labels Free. Brand New · Jamma Pcb. $6. Save up to 8% when you buy more. or Best Offer. JAMMA Mame Cabinet Wiring Harness Loom Multicade Arcade Game PCB Cable 10 Pack See more like this. JAMMA Wiring Harness Multicade 60 in 1 Arcade Game Cabinet Wire Labels.