95 xlt... No electric start, warmers off. When the engine is running, the lights will dim for 10 sec and then come back to full power for 40 sec. Then dim again, all at random intervals. All this while holding steady 3500 rpms. The engine does not have any difficulty running during the swings in light output. I have already went through the harness and have made no progress. Will a regulator cause this, or is it most likely the stator?