Why does your Yamaha 600 grizzly four wheeler NOT charge the battery when the fourwheeler is running New battery rebuilt motor Blows a fuse headlights go from bright to dim etc help?

id check the stater plate and make sure its rust free and then there should be an electrode plate that will keep your headlights at a steady strem of light that may be bad or disconnected also never rule out burn-bare touching wires too