After the effort of taking the voltage regulator / rectifier out a 1995 SLT 750 Polaris I investigated the circuit path from Stater to Rectifier . First of all inspect the wiring for any pinched or burned wires . Any one of the Yellow wires from the Stater leading back to the Control Box can cause problems . Any of the other wires from the Stater can also cause other problems .
In my next I will explain in detail how the Rectifier/Regulator works with pictures and technical explanations of parts and circuit schematics . This will help you fix your issue with battery not charging .
Look for my next post January 10th though 14th .