By what you described it sounds like a loose ground. Both chassis and rear carrier are grounded separately. From what you describe the chassis has a good ground because you show voltage. I would look around the CVT area you saw the spark. There is a ground from battery to usually CVT cover or the case right next to it. The wire is either loose corroded or burned up due to excessive heat from loose connection. I believe this is where your problem lies. I run a second ground from the battery to the engine case and have not had a problem. I have replaced many burned grounds sometimes having to go into the electrical box. Many of the older buggies would have 10 or more grounds twisted together then soldered. The problem with that is the inner wires will loosen after time due to lack of penetration of the solder causing this problem. Not a big deal to repair. Hope this helps get you on track.
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