that's a typical mess often seen on these old yerfs. The wiring was sloppy and problematic at best from the factory. Though there are wiring harnesses available, they are generic and built to accommodate various makes and models of buggys. The color coding will not match, the connectors won't match and there are circuits included for various accessories. it's just as difficult to marry a generic harness to work as it is to repair the existing harness. Your best bet is to start from scratch and create a new harness. this is a schematic of the yerf system if you tackle one circuit at a time. IE... starting, ignition , charging etc, it is not difficult. Remove the existing harness as intact as possible to use as a guide for lengths, routing etc. Use no less than 10g for all starting and battery connections and no less than 16g for all others. Delete the brake safety switch as it is problematic and really isn't needed, it allows the buggy to crank only when the brake pedal is depressed.
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