Emery Stora tells us that the green wire is for right turn/brake. Yellow is the left turn/brake. Brown is the taillights. White is the ground. The blue wire is a spare wire. It runs from behind the dash (or below it) to the back. It could be used for a break away, to bring power to a speedometer disconnect, etc. I believe that it goes to a 12 wire connector. This might be to the left side of the driver at the front of the side panel
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